This document provides an overview of using Session Initiation Protocol (SIP) and related technologies like VoiceXML and CCXML for building voice applications. It discusses the layers of a telephony application including the application layer, API/XML layer, and platform layer. It then explains key concepts of SIP like call setup using INVITE, response codes, and major SIP methods. The document provides code samples of using CCXML and VoiceXML to build an application that routes calls and posts results to Twitter.

1. Taking a SIP of Java
RJ Auburn
Voxeo Corporation
Chief Technology Officer

2. Telephony
2

3. Sucks
3

4. Expensive
4

5. Complex
5

6. Proprietary
6

7. This is not how it should be...
7

8. Simple
8

9. Ubiquitous
9

10. Open
10

11. So what are the layers?
11

12. Application
API XML Tools
Platform
12

13. Application
Application
API XML Tools
Platform
13

14. Application
API XML Tools
Platform
14

15. Application
API XML Tools
Platform
15

16. Application
API XML Tools
Platform
16

17. Some Basics:
Signaling vs Media
17

18. Call Control vs Media
> Phone systems often are split into two
components: Signaling and Media
> Signaling handles the setup and tear-down of
sessions and phone calls.
> Media is responsible for the transport voice path
18

19. Media vs Call Control in the PSTN - SIP
Proxy Proxy
SIP
A B
SIP
SIP
Alice RTP Bob
19

20. Media vs Call Control in the PSTN - SS7
SCP SCP
SS7
A B
SS7
7
SS
Alice Switched TDM Media Bob
20

21. Media vs Call Control in the PSTN - ISDN
D Channel (q.931)
Signaling
Dev Dev
A B
B Channels (23)
Media
21

22. All this means is the APIʼs
and standards for media vs
call control tend to be
different.
22

23. So now for
a bit about SIP
(Call Control)
23

24. SIP
> Session Initiation Protocol (SIP)
defines how to establish a
communication session between
two endpoints
> Primarily used for voice, but can for IM or virtually
any other protocol
> Almost always used in client/server configuration
with quot;SIP proxiesquot; in control of quot;SIP endpointsquot;
• Work going on in P2PSIP - see www.p2psip.org
> Text-based protocol, originally modeled on HTTP
24

25. SIP Communication
INVITE
Alice 180 RINGING Bob
200 OK
ACK
RTP (voice)
BYE
200 OK
25

26. Major SIP Methods
> INVITE
> BYE
> REFER
> REGISTER
> SUBSCRIBE
> NOTIFY
oh ya...
> INFO (wait, we are not supposed to talk about this one)
26

27. Response Codes
> 1xx - Provisional
> 2xx - All is good. Final
> 3xx - Redirects
> 4/5/6xx - Errors
27

28. SIP Resources
> Internet Engineering Task Force (IETF)
• RFC 3261
• Hitchhikerʼs Guide to SIP
> Open Source Info
• VoIP Info Wiki: www.voip-info.org
> Industry Sites
• SIP Forum: www.sipforum.org
• SIP Foundry: www.sipfoundry.org
28

29. So lets talk about...
29

30. Religion
30

31. Religion
31

32. XML
32

33. VoiceXML and CCXML
33

34. VoiceXML
> Language created by the W3C to
model computer human dialogs.
> Supports speech and touchtone.
> Built around a form filling model called the FIA.
> Voice equivalent to HTML.
> Focused on dialogs. Very limited call control.
> http://www.w3.org/TR/voicexml/
34

35. CCXML
> Call Control XML (CCXML) is the
W3C standard for call control
using XML
> Sister standard to VoiceXML
> Integrates with VoiceXML for dialog control
> Provides a framework for issuing call control
commands and handling call control events
> http://www.w3.org/TR/ccxml/
35

36. VoiceXML and CCXML Architecture
ASR
Phone CCXML VoiceXML mrcp
sip sip
TTS
rtp
36

37. Like Tribbles...
37

38. It has taken over the Enterprise...
38

39. How about some code?
39

40. Sample CCXML/VoiceXML application.
> Caller dials in to the application
> Caller is bridged to the subscriber
> Results of the call attempt are posted to Twitter via
their REST API
40

41. start
isRJ()
yes no
prompt for dest play twitter status
call dest call rj’s cell
end

42. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<accept/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;
cond=quot;event$.connection.remote=='tel:+18315551234'quot;>
<assign name=quot;statequot; expr=quot;'rjconnected'quot;/>
<dialogstart src=quot;'rj.vxml'quot;
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;>
<assign name=quot;statequot; expr=quot;'callconnected'quot;/>
<dialogstart src=quot;'caller.vxml'quot;
</transition>
<transition event=quot;dialog.exitquot; state=quot;callconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;'tel:+18315551234'quot;/>
</transition>
<transition event=quot;dialog.exitquot; state=quot;rjconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;event$.values.destquot;/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
</transition>
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<exit/>
</transition>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<exit/>
</transition>
</eventprocessor>
</ccxml>
42

43. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<accept/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;
cond=quot;event$.connection.remote=='tel:+18315551234'quot;>
<assign name=quot;statequot; expr=quot;'rjconnected'quot;/>
<dialogstart src=quot;'rj.vxml'quot;
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;>
<assign name=quot;statequot; expr=quot;'callconnected'quot;/>
<dialogstart src=quot;'caller.vxml'quot;
</transition>
<transition event=quot;dialog.exitquot; state=quot;callconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;'tel:+18315551234'quot;/>
</transition>
<transition event=quot;dialog.exitquot; state=quot;rjconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;event$.values.destquot;/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
</transition>
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<exit/>
</transition>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<exit/>
</transition>
</eventprocessor>
</ccxml>
43

44. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<accept/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;
cond=quot;event$.connection.remote=='tel:+18315551234'quot;>
<assign name=quot;statequot; expr=quot;'rjconnected'quot;/>
<dialogstart src=quot;'rj.vxml'quot;
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;>
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<assign name=quot;statequot; expr=quot;'callconnected'quot;/>
<dialogstart src=quot;'caller.vxml'quot;
<ccxml version=quot;1.0quot;
</transition>
<transition event=quot;dialog.exitquot; state=quot;callconnectedquot;>
<assign xmlns=quot;http://www.w3.org/2002/09/ccxmlquot;>
name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;'tel:+18315551234'quot;/>
</ccxml>
</transition>
<transition event=quot;dialog.exitquot; state=quot;rjconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;event$.values.destquot;/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
</transition>
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<exit/>
</transition>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<exit/>
</transition>
</eventprocessor>
</ccxml>
44

45. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<accept/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;
cond=quot;event$.connection.remote=='tel:+18315551234'quot;>
<assign name=quot;statequot; expr=quot;'rjconnected'quot;/>
<dialogstart src=quot;'rj.vxml'quot;
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;>
<assign name=quot;statequot; expr=quot;'callconnected'quot;/>
<dialogstart src=quot;'caller.vxml'quot;
</transition>
<transition event=quot;dialog.exitquot; state=quot;callconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;'tel:+18315551234'quot;/>
</transition>
<transition event=quot;dialog.exitquot; state=quot;rjconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;event$.values.destquot;/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
</transition>
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<exit/>
</transition>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<exit/>
</transition>
</eventprocessor>
</ccxml>
45

46. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<accept/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;
cond=quot;event$.connection.remote=='tel:+18315551234'quot;>
<assign name=quot;statequot; expr=quot;'rjconnected'quot;/>
<dialogstart src=quot;'rj.vxml'quot;
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;>
<assign name=quot;statequot; expr=quot;'callconnected'quot;/>
<dialogstart src=quot;'caller.vxml'quot; expr=quot;'init'quot;/>
<var name=quot;statequot;
</transition>
<transition<var name=quot;incomingcallquot;/>
event=quot;dialog.exitquot; state=quot;callconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<eventprocessor statevariable=quot;statequot;>
<createcall dest=quot;'tel:+18315551234'quot;/>
</transition>
<transition</eventprocessor>
event=quot;dialog.exitquot; state=quot;rjconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;event$.values.destquot;/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
</transition>
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<exit/>
</transition>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<exit/>
</transition>
</eventprocessor>
</ccxml>
46

47. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<accept/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;
cond=quot;event$.connection.remote=='tel:+18315551234'quot;>
<assign name=quot;statequot; expr=quot;'rjconnected'quot;/>
<dialogstart src=quot;'rj.vxml'quot;
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;>
<assign name=quot;statequot; expr=quot;'callconnected'quot;/>
<dialogstart src=quot;'caller.vxml'quot;
</transition>
<transition event=quot;dialog.exitquot; state=quot;callconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;'tel:+18315551234'quot;/>
</transition>
<transition event=quot;dialog.exitquot; state=quot;rjconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;event$.values.destquot;/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
</transition>
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<exit/>
</transition>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<exit/>
</transition>
</eventprocessor>
</ccxml>
47

48. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<accept/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;
cond=quot;event$.connection.remote=='tel:+18315551234'quot;>
<assign name=quot;statequot; expr=quot;'rjconnected'quot;/>
<dialogstart src=quot;'rj.vxml'quot;
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;>
<assign name=quot;statequot; expr=quot;'callconnected'quot;/>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<dialogstart src=quot;'caller.vxml'quot;
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
</transition>
<transition event=quot;dialog.exitquot; state=quot;callconnectedquot;>
<accept/> dest=quot;'tel:+18315551234'quot;/>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall
</transition>
</transition>
<transition event=quot;dialog.exitquot; state=quot;rjconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;event$.values.destquot;/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
</transition>
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<exit/>
</transition>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<exit/>
</transition>
</eventprocessor>
</ccxml>
48

49. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<accept/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;
cond=quot;event$.connection.remote=='tel:+18315551234'quot;>
<assign name=quot;statequot; expr=quot;'rjconnected'quot;/>
<dialogstart src=quot;'rj.vxml'quot;
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;>
<assign name=quot;statequot; expr=quot;'callconnected'quot;/>
<dialogstart src=quot;'caller.vxml'quot;
</transition>
<transition event=quot;dialog.exitquot; state=quot;callconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;'tel:+18315551234'quot;/>
</transition>
<transition event=quot;dialog.exitquot; state=quot;rjconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;event$.values.destquot;/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
</transition>
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<exit/>
</transition>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<exit/>
</transition>
</eventprocessor>
</ccxml>
49

50. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<accept/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;
cond=quot;event$.connection.remote=='tel:+18315551234'quot;>
<assign name=quot;statequot; expr=quot;'rjconnected'quot;/>
<dialogstart src=quot;'rj.vxml'quot;
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;>
<transition event=quot;connection.connectedquot; state=quot;initquot;
<assign name=quot;statequot; expr=quot;'callconnected'quot;/>
<dialogstart src=quot;'caller.vxml'quot;
cond=quot;event$.connection.remote=='tel:+18315551234'quot;>
</transition>
<transition event=quot;dialog.exitquot; state=quot;callconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<assign name=quot;statequot; expr=quot;'rjconnected'quot;/>
<createcall dest=quot;'tel:+18315551234'quot;/>
<dialogstart src=quot;'rj.vxml'quot;
</transition>
<transition event=quot;dialog.exitquot; state=quot;rjconnectedquot;>
</transition>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;event$.values.destquot;/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
</transition>
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<exit/>
</transition>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<exit/>
</transition>
</eventprocessor>
</ccxml>
50

51. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<var name=quot;tURLquot;
expr=quot;'http://zscgeek:password@twitter.com/statuses/update.xml'quot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<accept/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;>
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<vxml xmlns=quot;http://www.w3.org/2001/vxmlquot; version=quot;2.1quot;>
<createcall dest=quot;'tel:+18312392883'quot;/>
</transition>
<form>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<field name=quot;destquot; type=quot;digits?length=10quot;>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
<var name=quot;statusquot; expr=quot;'RJ is on the phone'quot;/>
<send <prompt>Welcome RJ. Please enter the phone
targettype=quot;'basichttp'quot; name=quot;'update'quot;
target=quot;tURLquot; namelist=quot;statusquot;/>
</transition> number you wish to reach.</prompt>
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<filled>
<assign name=quot;statequot; expr=quot;'done'quot;/>
<var name=quot;statusquot; expr=quot;'RJ is not answering his phone'quot;/>
<send <exit namelist=quot;destquot;/>
targettype=quot;'basichttp'quot; name=quot;'update'quot;
target=quot;tURLquot; namelist=quot;statusquot;/>
</filled>
</transition>
</field>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<assign name=quot;statequot; expr=quot;'done'quot;/>
</form>
<var name=quot;statusquot; expr=quot;'RJ is off the phone'quot;/>
<send targettype=quot;'basichttp'quot; name=quot;'update'quot;
</vxml> target=quot;tURLquot; namelist=quot;statusquot;/>
</transition>
<transition event=quot;send.successfulquot; state=quot;donequot;>
<exit/>
</transition>
</eventprocessor>
</ccxml>
51

52. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<accept/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;
cond=quot;event$.connection.remote=='tel:+18315551234'quot;>
<assign name=quot;statequot; expr=quot;'rjconnected'quot;/>
<dialogstart src=quot;'rj.vxml'quot;
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;>
<assign name=quot;statequot; expr=quot;'callconnected'quot;/>
<dialogstart src=quot;'caller.vxml'quot;
</transition>
<transition event=quot;dialog.exitquot; state=quot;callconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;'tel:+18315551234'quot;/>
</transition>
<transition event=quot;dialog.exitquot; state=quot;rjconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;event$.values.destquot;/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
</transition>
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<exit/>
</transition>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<exit/>
</transition>
</eventprocessor>
</ccxml>
52

53. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<accept/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;
cond=quot;event$.connection.remote=='tel:+18315551234'quot;>
<assign name=quot;statequot; expr=quot;'rjconnected'quot;/>
<dialogstart src=quot;'rj.vxml'quot;
<transition event=quot;connection.connectedquot; state=quot;initquot;>
</transition>
<assign name=quot;statequot; expr=quot;'callconnected'quot;/>
<transition name=quot;statequot; expr=quot;'callconnected'quot;/>
<assign
event=quot;connection.connectedquot; state=quot;initquot;>
<dialogstart src=quot;'caller.vxml'quot;
<dialogstart src=quot;'caller.vxml'quot;
</transition>
</transition>
<transition event=quot;dialog.exitquot; state=quot;callconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;'tel:+18315551234'quot;/>
</transition>
<transition event=quot;dialog.exitquot; state=quot;rjconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;event$.values.destquot;/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
</transition>
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<exit/>
</transition>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<exit/>
</transition>
</eventprocessor>
</ccxml>
53

54. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<var name=quot;tURLquot;
expr=quot;'http://zscgeek:password@twitter.com/statuses/update.xml'quot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<accept/>
</transition>
<vxml xmlns=quot;http://www.w3.org/2001/vxmlquot; version=quot;2.1quot;>
<transition event=quot;connection.connectedquot; state=quot;initquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<form> name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<assign
<createcall dest=quot;'tel:+18312392883'quot;/>
<block>
</transition>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
<data src=quot;http://twitter.com/statuses/
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
user_timeline.xml?screen_name=zscgeekquot;
<var name=quot;statusquot; expr=quot;'RJ is on the phone'quot;/>
<send targettype=quot;'basichttp'quot; name=quot;'update'quot;
name=quot;twitterquot; ecmaxmltype=quot;e4xquot; />
target=quot;tURLquot; namelist=quot;statusquot;/>
</transition>
<prompt>Thank you for calling RJ.
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<assign We will connect you now.
name=quot;statequot; expr=quot;'done'quot;/>
<var name=quot;statusquot; expr=quot;'RJ is not answering his phone'quot;/>
His twitter status is
<send targettype=quot;'basichttp'quot; name=quot;'update'quot;
target=quot;tURLquot; namelist=quot;statusquot;/>
<value expr=quot;twitter.statuses.status[0].textquot;/>
</transition>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
</prompt>
<assign name=quot;statequot; expr=quot;'done'quot;/>
<var name=quot;statusquot; expr=quot;'RJ is off the phone'quot;/>
</block>
<send targettype=quot;'basichttp'quot; name=quot;'update'quot;
target=quot;tURLquot; namelist=quot;statusquot;/>
</form> event=quot;send.successfulquot; state=quot;donequot;>
</transition>
<transition
</vxml>
<exit/>
</transition>
</eventprocessor>
</ccxml>
54

55. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<accept/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;
cond=quot;event$.connection.remote=='tel:+18315551234'quot;>
<assign name=quot;statequot; expr=quot;'rjconnected'quot;/>
<dialogstart src=quot;'rj.vxml'quot;
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;>
<assign name=quot;statequot; expr=quot;'callconnected'quot;/>
<dialogstart src=quot;'caller.vxml'quot;
</transition>
<transition event=quot;dialog.exitquot; state=quot;callconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;'tel:+18315551234'quot;/>
</transition>
<transition event=quot;dialog.exitquot; state=quot;rjconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;event$.values.destquot;/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
</transition>
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<exit/>
</transition>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<exit/>
</transition>
</eventprocessor>
</ccxml>
55

56. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<accept/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;
cond=quot;event$.connection.remote=='tel:+18315551234'quot;>
<assign name=quot;statequot; expr=quot;'rjconnected'quot;/>
<dialogstart src=quot;'rj.vxml'quot;
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;>
<assign name=quot;statequot; expr=quot;'callconnected'quot;/>
<dialogstart src=quot;'caller.vxml'quot;
</transition>
<transition event=quot;dialog.exitquot; state=quot;callconnectedquot;>
<transition
event=quot;dialog.exitquot; state=quot;callconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;'tel:+18315551234'quot;/>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
</transition>
<transition event=quot;dialog.exitquot; state=quot;rjconnectedquot;>
<createcall dest=quot;'tel:+18315551234'quot;/>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
</transition> dest=quot;event$.values.destquot;/>
<createcall
</transition>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
</transition>
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<exit/>
</transition>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<exit/>
</transition>
</eventprocessor>
</ccxml>
56

57. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<accept/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;
cond=quot;event$.connection.remote=='tel:+18315551234'quot;>
<assign name=quot;statequot; expr=quot;'rjconnected'quot;/>
<dialogstart src=quot;'rj.vxml'quot;
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;>
<assign name=quot;statequot; expr=quot;'callconnected'quot;/>
<dialogstart src=quot;'caller.vxml'quot;
</transition>
<transition event=quot;dialog.exitquot; state=quot;callconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;'tel:+18315551234'quot;/>
</transition>
<transition event=quot;dialog.exitquot; state=quot;rjconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;event$.values.destquot;/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
</transition>
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<exit/>
</transition>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<exit/>
</transition>
</eventprocessor>
</ccxml>
57

58. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<accept/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;
cond=quot;event$.connection.remote=='tel:+18315551234'quot;>
<assign name=quot;statequot; expr=quot;'rjconnected'quot;/>
<dialogstart src=quot;'rj.vxml'quot;
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;>
<assign name=quot;statequot; expr=quot;'callconnected'quot;/>
<dialogstart src=quot;'caller.vxml'quot;
</transition>
<transition event=quot;dialog.exitquot; state=quot;callconnectedquot;>
<transition name=quot;statequot; expr=quot;'calling'quot;/>
<assign event=quot;dialog.exitquot; state=quot;rjconnectedquot;>
<createcall dest=quot;'tel:+18315551234'quot;/>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
</transition>
<transition event=quot;dialog.exitquot; state=quot;rjconnectedquot;>
<createcall dest=quot;event$.values.destquot;/>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
</transition> dest=quot;event$.values.destquot;/>
<createcall
</transition>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
</transition>
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<exit/>
</transition>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<exit/>
</transition>
</eventprocessor>
</ccxml>
58

59. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<accept/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;
cond=quot;event$.connection.remote=='tel:+18315551234'quot;>
<assign name=quot;statequot; expr=quot;'rjconnected'quot;/>
<dialogstart src=quot;'rj.vxml'quot;
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;>
<assign name=quot;statequot; expr=quot;'callconnected'quot;/>
<dialogstart src=quot;'caller.vxml'quot;
</transition>
<transition event=quot;dialog.exitquot; state=quot;callconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;'tel:+18315551234'quot;/>
</transition>
<transition event=quot;dialog.exitquot; state=quot;rjconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;event$.values.destquot;/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
</transition>
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<exit/>
</transition>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<exit/>
</transition>
</eventprocessor>
</ccxml>
59

60. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<accept/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;
cond=quot;event$.connection.remote=='tel:+18315551234'quot;>
<assign name=quot;statequot; expr=quot;'rjconnected'quot;/>
<dialogstart src=quot;'rj.vxml'quot;
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;>
<assign name=quot;statequot; expr=quot;'callconnected'quot;/>
<dialogstart src=quot;'caller.vxml'quot;
</transition>
<transition event=quot;connection.connectedquot;
<transition event=quot;dialog.exitquot; state=quot;callconnectedquot;>
state=quot;callingquot;> expr=quot;'calling'quot;/>
<assign name=quot;statequot;
<createcall dest=quot;'tel:+18315551234'quot;/>
</transition>
<transition event=quot;dialog.exitquot; expr=quot;'connected'quot;/>
<assign name=quot;statequot; state=quot;rjconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
<createcall dest=quot;event$.values.destquot;/>
</transition>
</transition>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
</transition>
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<exit/>
</transition>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<exit/>
</transition>
</eventprocessor>
</ccxml>
60

61. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<accept/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;
cond=quot;event$.connection.remote=='tel:+18315551234'quot;>
<assign name=quot;statequot; expr=quot;'rjconnected'quot;/>
<dialogstart src=quot;'rj.vxml'quot;
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;>
<assign name=quot;statequot; expr=quot;'callconnected'quot;/>
<dialogstart src=quot;'caller.vxml'quot;
</transition>
<transition event=quot;dialog.exitquot; state=quot;callconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;'tel:+18315551234'quot;/>
</transition>
<transition event=quot;dialog.exitquot; state=quot;rjconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;event$.values.destquot;/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
</transition>
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<exit/>
</transition>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<exit/>
</transition>
</eventprocessor>
</ccxml>
61

62. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<accept/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;
cond=quot;event$.connection.remote=='tel:+18315551234'quot;>
<assign name=quot;statequot; expr=quot;'rjconnected'quot;/>
<dialogstart src=quot;'rj.vxml'quot;
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;>
<assign name=quot;statequot; expr=quot;'callconnected'quot;/>
<dialogstart src=quot;'caller.vxml'quot;
<transition event=quot;connection.failedquot; state=quot;callingquot;>
</transition>
<transition event=quot;dialog.exitquot; state=quot;callconnectedquot;>
<exit/> name=quot;statequot; expr=quot;'calling'quot;/>
<assign
</transition> dest=quot;'tel:+18315551234'quot;/>
<createcall
</transition>
<transition event=quot;dialog.exitquot; state=quot;rjconnectedquot;>
<transition name=quot;statequot; expr=quot;'calling'quot;/>
<assign event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<createcall dest=quot;event$.values.destquot;/>
<exit/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
</transition>
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
</transition>
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<exit/>
</transition>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<exit/>
</transition>
</eventprocessor>
</ccxml>
62

63. Call router + Twitter
<?xml version=quot;1.0quot; encoding=quot;UTF-8quot;?>
<ccxml xmlns=quot;http://www.w3.org/2002/09/ccxmlquot; version=quot;1.0quot;>
<var name=quot;statequot; expr=quot;'init'quot;/>
<var name=quot;incomingcallquot;/>
<eventprocessor statevariable=quot;statequot;>
<transition event=quot;connection.alertingquot; state=quot;initquot;>
<assign name=quot;incomingcallquot; expr=quot;event$.connectionidquot;/>
<accept/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;
cond=quot;event$.connection.remote=='tel:+18315551234'quot;>
<assign name=quot;statequot; expr=quot;'rjconnected'quot;/>
<dialogstart src=quot;'rj.vxml'quot;
</transition>
<transition event=quot;connection.connectedquot; state=quot;initquot;>
<assign name=quot;statequot; expr=quot;'callconnected'quot;/>
<dialogstart src=quot;'caller.vxml'quot;
</transition>
<transition event=quot;dialog.exitquot; state=quot;callconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;'tel:+18315551234'quot;/>
</transition>
<transition event=quot;dialog.exitquot; state=quot;rjconnectedquot;>
<assign name=quot;statequot; expr=quot;'calling'quot;/>
<createcall dest=quot;event$.values.destquot;/>
</transition>
<transition event=quot;connection.connectedquot; state=quot;callingquot;>
<assign name=quot;statequot; expr=quot;'connected'quot;/>
<join id1=quot;event$.connectionidquot; id2=quot;incomingcallquot;/>
</transition>
<transition event=quot;connection.failedquot; state=quot;callingquot;>
<exit/>
</transition>
<transition event=quot;connection.disconnectedquot; state=quot;connectedquot;>
<exit/>
</transition>
</eventprocessor>
</ccxml>
63

64. So... How about APIʼs...
64

65. A Favorite of Carriers
65

66. Java
66

67. SIP Servlets
> Standard Java based API for
writing SIP applications.
> 1.0 standardized as JSR-116.
> 1.1 just released as JSR-289
> Extends the HTTP Servlet
model to support SIP and
telephony applications
> http://www.sipservlet.com/
> Supported by a large number of
application servers including
Oracle (BEA), IBM, Sun,
Voxeo.
67

68. Request Methods
> doInvite(SipServletRequest req);
> doAck(SipServletRequest req);
> doOptions(SipServletRequest req);
> doBye(SipServletRequest req);
> doCancel(SipServletRequest req);
> doSubscribe(SipServletRequest req);
> doNotify(SipServletRequest req);
> doMessage(SipServletRequest req);
> doInfo(SipServletRequest req);
> doPrack(SipServletRequest req);
68

69. Response Methods
> doProvisionalResponse(SipServletResponse res);
> doSuccessResponse(SipServletResponse res);
> doRedirectResponse(SipServletResponse res);
> doErrorResponse(SipServletResponse res);
69

70. Basic Request
public class BasicSIPServlet extends SipServlet {
protected void doInfo(SipServletRequest req)
throws ServletException, IOException
{
req.createResponse(SipServletResponse.SC_TRYING).send();
// do stuff
req.createResponse(SipServletResponse.SC_OK).send();
}
}
70

71. Accessing SIP Headers
protected void doInvite(SipServletRequest req) throws
ServletException, IOException {
String cpc ;
if (req.getHeader(quot;User-Agentquot;).equals(quot;Sonusquot;)) {
cpc = req.getHeader(quot;CallPartyquot;);
} else if (req.getHeader(quot;User-Agentquot;).equals(quot;ZTEquot;)) {
cpc = req.getHeader(quot;CPSquot;);
}
}
71

72. JSR-309
> Java Media Server
API
> Based on the
CCXML media
model
> Still in draft stage
> Provides dialog
resources,
conferencing, media
routing to Java
applications
72

73. Sample Application Overview
> Lets try that application again in java...
73

74. start
isRJ()
yes no
prompt for dest play twitter status
call dest call rj’s cell
end

75. SIP Flow
Caller App Dest
INVITE - doInvite()
200 OK
ACK doAck()
INVITE - transferDialog()
200 OK -
doSuccessResponse()
ACK
75

76. Call router + Twitter
public class TwitterSIPServlet extends SipServlet {
SipFactory factory;
public void init() throws ServletException {
super.init();
factory =(SipFactory)getServletContext().getAttribute(quot;javax.servlet.sip.SipFactoryquot;);
}
protected void doInvite(SipServletRequest req) {
if(req.isInitial()){
SipApplicationSession sipApp = factory.createApplicationSession();
TwitterSIPServletSession service = new TwitterSIPServletSession(req.getSession(),
factory);
sipApp.setAttribute(quot;router-appquot;, service);
service.init(req);
}
}
protected void doSuccessResponse(SipServletResponse resp) {
resp.createAck().send();
}
protected void doAck(SipServletRequest req) {
final TwitterSIPServletSession service
= (TwitterSIPServletSession) req.getApplicationSession().getAttribute(quot;router-
appquot;);
service.startDialog();
}
protected void doBye(SipServletRequest req) {
// Need to send BYE request to the other legs
}
}
76

77. Call router + Twitter
public class TwitterSIPServlet extends SipServlet {
SipFactory factory;
public void init() throws ServletException {
super.init();
factory =(SipFactory)getServletContext().getAttribute(quot;javax.servlet.sip.SipFactoryquot;);
}
protected void doInvite(SipServletRequest req) {
if(req.isInitial()){
SipApplicationSession sipApp = factory.createApplicationSession();
TwitterSIPServletSession service = new TwitterSIPServletSession(req.getSession(),
factory);
sipApp.setAttribute(quot;router-appquot;, service);
service.init(req);
}
}
protected void doSuccessResponse(SipServletResponse resp) {
resp.createAck().send();
}
protected void doAck(SipServletRequest req) {
final TwitterSIPServletSession service
= (TwitterSIPServletSession) req.getApplicationSession().getAttribute(quot;router-
appquot;);
service.startDialog();
}
protected void doBye(SipServletRequest req) {
// Need to send BYE request to the other legs
}
}
77

78. Call router + Twitter
public class TwitterSIPServlet extends SipServlet {
SipFactory factory;
public void init() throws ServletException {
public class TwitterSIPServlet extends SipServlet {
super.init();
factory =(SipFactory)getServletContext().getAttribute(quot;javax.servlet.sip.SipFactoryquot;);
SipFactory factory;
}
protected void doInvite(SipServletRequest req) {
if(req.isInitial()){
public void init() sipApp = factory.createApplicationSession();
SipApplicationSession throws ServletException {
TwitterSIPServletSession service = new TwitterSIPServletSession(req.getSession(),
super.init();
factory);
sipApp.setAttribute(quot;router-appquot;, service);
}
factory = (SipFactory)getServletContext()
service.init(req);
} .getAttribute(quot;javax.servlet.sip.SipFactoryquot;);
}
protected void doSuccessResponse(SipServletResponse resp) {
resp.createAck().send();
} }
protected void doAck(SipServletRequest req) {
final TwitterSIPServletSession service
= (TwitterSIPServletSession) req.getApplicationSession().getAttribute(quot;router-
appquot;);
service.startDialog();
}
protected void doBye(SipServletRequest req) {
// Need to send BYE request to the other legs
}
}
78

79. Call router + Twitter
public class TwitterSIPServlet extends SipServlet {
SipFactory factory;
public void init() throws ServletException {
super.init();
factory =(SipFactory)getServletContext().getAttribute(quot;javax.servlet.sip.SipFactoryquot;);
}
protected void doInvite(SipServletRequest req) {
if(req.isInitial()){
SipApplicationSession sipApp = factory.createApplicationSession();
TwitterSIPServletSession service = new TwitterSIPServletSession(req.getSession(),
factory);
sipApp.setAttribute(quot;router-appquot;, service);
service.init(req);
}
}
protected void doSuccessResponse(SipServletResponse resp) {
resp.createAck().send();
}
protected void doAck(SipServletRequest req) {
final TwitterSIPServletSession service
= (TwitterSIPServletSession) req.getApplicationSession().getAttribute(quot;router-
appquot;);
service.startDialog();
}
protected void doBye(SipServletRequest req) {
// Need to send BYE request to the other legs
}
}
79

80. Call router + Twitter
public class TwitterSIPServlet extends SipServlet {
SipFactory factory;
public void init() throws ServletException {
super.init();
factory =(SipFactory)getServletContext().getAttribute(quot;javax.servlet.sip.SipFactoryquot;);
}
protected void doInvite(SipServletRequest req) {
protected void doInvite(SipServletRequest req) {
if(req.isInitial()){
SipApplicationSession sipApp = factory.createApplicationSession();
if(req.isInitial()){
TwitterSIPServletSession service = new TwitterSIPServletSession(req.getSession(),
factory);
sipApp.setAttribute(quot;router-appquot;, service);
SipApplicationSession sipApp
service.init(req);
} = factory.createApplicationSession();
}
TwitterSIPServletSession service
protected void doSuccessResponse(SipServletResponse resp) {
} = new TwitterSIPServletSession(req.getSession(),
resp.createAck().send(); factory);
sipApp.setAttribute(quot;router-appquot;, service);
protected void doAck(SipServletRequest req) {
service.init(req);
final TwitterSIPServletSession service
= (TwitterSIPServletSession) req.getApplicationSession().getAttribute(quot;router-
}
appquot;);
service.startDialog();
}}
protected void doBye(SipServletRequest req) {
// Need to send BYE request to the other legs
}
}
80

81. Call router + Twitter
public class TwitterSIPServlet extends SipServlet {
SipFactory factory;
public void init() throws ServletException {
super.init();
factory =(SipFactory)getServletContext().getAttribute(quot;javax.servlet.sip.SipFactoryquot;);
}
protected void doInvite(SipServletRequest req) {
if(req.isInitial()){
SipApplicationSession sipApp = factory.createApplicationSession();
TwitterSIPServletSession service = new TwitterSIPServletSession(req.getSession(),
factory);
sipApp.setAttribute(quot;router-appquot;, service);
service.init(req);
}
}
protected void doSuccessResponse(SipServletResponse resp) {
resp.createAck().send();
}
protected void doAck(SipServletRequest req) {
final TwitterSIPServletSession service
= (TwitterSIPServletSession) req.getApplicationSession().getAttribute(quot;router-
appquot;);
service.startDialog();
}
protected void doBye(SipServletRequest req) {
// Need to send BYE request to the other legs
}
}
81

82. Call router + Twitter
public class TwitterSIPServlet extends SipServlet {
SipFactory factory;
public void init() throws ServletException {
super.init();
factory =(SipFactory)getServletContext().getAttribute(quot;javax.servlet.sip.SipFactoryquot;);
}
protected void doInvite(SipServletRequest req) {
if(req.isInitial()){
SipApplicationSession sipApp = factory.createApplicationSession();
TwitterSIPServletSession service = new TwitterSIPServletSession(req.getSession(),
factory);
protected void doSuccessResponse(SipServletResponse resp) {
sipApp.setAttribute(quot;router-appquot;, service);
resp.createAck().send();
}
service.init(req);
}}
protected void doSuccessResponse(SipServletResponse resp) {
resp.createAck().send();
}
protected void doAck(SipServletRequest req) {
final TwitterSIPServletSession service
= (TwitterSIPServletSession) req.getApplicationSession().getAttribute(quot;router-
appquot;);
service.startDialog();
}
protected void doBye(SipServletRequest req) {
// Need to send BYE request to the other legs
}
}
82

83. Call router + Twitter
public class TwitterSIPServlet extends SipServlet {
SipFactory factory;
public void init() throws ServletException {
super.init();
factory =(SipFactory)getServletContext().getAttribute(quot;javax.servlet.sip.SipFactoryquot;);
}
protected void doInvite(SipServletRequest req) {
if(req.isInitial()){
SipApplicationSession sipApp = factory.createApplicationSession();
TwitterSIPServletSession service = new TwitterSIPServletSession(req.getSession(),
factory);
sipApp.setAttribute(quot;router-appquot;, service);
service.init(req);
}
}
protected void doSuccessResponse(SipServletResponse resp) {
resp.createAck().send();
}
protected void doAck(SipServletRequest req) {
final TwitterSIPServletSession service
= (TwitterSIPServletSession) req.getApplicationSession().getAttribute(quot;router-
appquot;);
service.startDialog();
}
protected void doBye(SipServletRequest req) {
// Need to send BYE request to the other legs
}
}
83

84. Call router + Twitter
public class TwitterSIPServlet extends SipServlet {
SipFactory factory;
public void init() throws ServletException {
super.init();
factory =(SipFactory)getServletContext().getAttribute(quot;javax.servlet.sip.SipFactoryquot;);
}
protected void doAck(SipServletRequest req) {
protected void doInvite(SipServletRequest req) {
if(req.isInitial()){
final TwitterSIPServletSession service
SipApplicationSession sipApp = factory.createApplicationSession();
TwitterSIPServletSession service = new TwitterSIPServletSession(req.getSession(),
factory);
= (TwitterSIPServletSession) req.getApplicationSession()
sipApp.setAttribute(quot;router-appquot;, service);
service.init(req); .getAttribute(quot;router-appquot;);
}
} service.startDialog();
} resp.createAck().send();
protected void doSuccessResponse(SipServletResponse resp) {
}
protected void doAck(SipServletRequest req) {
final TwitterSIPServletSession service
= (TwitterSIPServletSession) req.getApplicationSession().getAttribute(quot;router-
appquot;);
service.startDialog();
}
protected void doBye(SipServletRequest req) {
// Need to send BYE request to the other legs
}
}
84

85. Call router + Twitter
public class TwitterSIPServlet extends SipServlet {
SipFactory factory;
public void init() throws ServletException {
super.init();
factory =(SipFactory)getServletContext().getAttribute(quot;javax.servlet.sip.SipFactoryquot;);
}
protected void doInvite(SipServletRequest req) {
if(req.isInitial()){
SipApplicationSession sipApp = factory.createApplicationSession();
TwitterSIPServletSession service = new TwitterSIPServletSession(req.getSession(),
factory);
sipApp.setAttribute(quot;router-appquot;, service);
service.init(req);
}
}
protected void doSuccessResponse(SipServletResponse resp) {
resp.createAck().send();
}
protected void doAck(SipServletRequest req) {
final TwitterSIPServletSession service
= (TwitterSIPServletSession) req.getApplicationSession().getAttribute(quot;router-
appquot;);
service.startDialog();
}
protected void doBye(SipServletRequest req) {
// Need to send BYE request to the other legs
}
}
85

86. Call router + Twitter
public class TwitterSIPServlet extends SipServlet {
SipFactory factory;
public void init() throws ServletException {
super.init();
factory =(SipFactory)getServletContext().getAttribute(quot;javax.servlet.sip.SipFactoryquot;);
}
protected void doInvite(SipServletRequest req) {
if(req.isInitial()){
SipApplicationSession sipApp = factory.createApplicationSession();
TwitterSIPServletSession service = new TwitterSIPServletSession(req.getSession(),
factory); protected void doBye(SipServletRequest req) {
sipApp.setAttribute(quot;router-appquot;, service);
service.init(req);the frack has cleanup code in
// Who
}
} // slide demo’s anyway?
protected }void doSuccessResponse(SipServletResponse resp) {
resp.createAck().send();
}
protected void doAck(SipServletRequest req) {
final TwitterSIPServletSession service
= (TwitterSIPServletSession) req.getApplicationSession().getAttribute(quot;router-
appquot;);
service.startDialog();
}
protected void doBye(SipServletRequest req) {
// Need to send BYE request to the other legs
}
}
86

87. Call router + Twitter
public class TwitterSIPServlet extends SipServlet {
SipFactory factory;
public void init() throws ServletException {
super.init();
factory =(SipFactory)getServletContext().getAttribute(quot;javax.servlet.sip.SipFactoryquot;);
}
protected void doInvite(SipServletRequest req) {
if(req.isInitial()){
SipApplicationSession sipApp = factory.createApplicationSession();
TwitterSIPServletSession service = new TwitterSIPServletSession(req.getSession(),
factory);
sipApp.setAttribute(quot;router-appquot;, service);
service.init(req);
}
}
protected void doSuccessResponse(SipServletResponse resp) {
resp.createAck().send();
}
protected void doAck(SipServletRequest req) {
final TwitterSIPServletSession service
= (TwitterSIPServletSession) req.getApplicationSession().getAttribute(quot;router-
appquot;);
service.startDialog();
}
protected void doBye(SipServletRequest req) {
// Need to send BYE request to the other legs
}
}
87

88. Call router + Twitter
public class TwitterSIPServletSession {
final SipSession mySipSession;
final SipFactory myFactory;
MediaGroup myMediaGroup;
boolean isRJ = false;
public TwitterSIPServletSession(SipSession aSipSession, SipFactory aFactory) {
...
}
public void init(final SipServletRequest req) {
...
}
public void startDialog() {
...
}
class CallerPlayerListener implements MediaEventListener<PlayerEvent> {
...
}
class RJDialerSignalDetectorListener
implements MediaEventListener<SignalDetectorEvent> {
...
}
void transferDialog(String uri) throws ServletParseException, IOException {
...
}
}
88

89. Call router + Twitter
public class TwitterSIPServletSession {
final SipSession mySipSession;
final SipFactory myFactory;
MediaGroup myMediaGroup;
boolean isRJ = false;
public TwitterSIPServletSession(SipSession aSipSession, SipFactory aFactory) {
...
}
public void init(final SipServletRequest req) {
...
}
public void startDialog() {
...
}
class CallerPlayerListener implements MediaEventListener<PlayerEvent> {
...
}
class RJDialerSignalDetectorListener
implements MediaEventListener<SignalDetectorEvent> {
...
}
void transferDialog(String uri) throws ServletParseException, IOException {
...
}
}
89

90. Call router + Twitter
public class TwitterSIPServletSession {
final SipSession mySipSession;
final SipFactory myFactory;
MediaGroup myMediaGroup;
boolean isRJ = false;
public TwitterSIPServletSession(SipSession aSipSession, SipFactory aFactory) {
...
}
public void init(final SipServletRequest req) {
public class TwitterSIPServletSession
... {
}
final SipSession mySipSession;
public void startDialog() {
final SipFactory myFactory;
...
}
MediaGroup myMediaGroup;
boolean isRJ = false;
class CallerPlayerListener implements MediaEventListener<PlayerEvent> {
...
}
public TwitterSIPServletSession(SipSession aSipSession,
class RJDialerSignalDetectorListener
implements MediaEventListener<SignalDetectorEvent> {
... SipFactory aFactory) {
} mySipSession = aSipSession;
... myFactory = aFactory;
void transferDialog(String uri) throws ServletParseException, IOException {
}
} }
}
90

91. Call router + Twitter
public class TwitterSIPServletSession {
final SipSession mySipSession;
final SipFactory myFactory;
MediaGroup myMediaGroup;
boolean isRJ = false;
public TwitterSIPServletSession(SipSession aSipSession, SipFactory aFactory) {
...
}
public void init(final SipServletRequest req) {
...
}
public void startDialog() {
...
}
class CallerPlayerListener implements MediaEventListener<PlayerEvent> {
...
}
class RJDialerSignalDetectorListener
implements MediaEventListener<SignalDetectorEvent> {
...
}
void transferDialog(String uri) throws ServletParseException, IOException {
...
}
}
91

92. Call router + Twitter
public class TwitterSIPServletSession {
final SipSession mySipSession;
final SipFactory myFactory;
MediaGroup myMediaGroup;
boolean isRJ = false;
public TwitterSIPServletSession(SipSession aSipSession, SipFactory aFactory) {
...
}
public void init(final SipServletRequest req) throws ServletException {
MediaSession myMediaSession = MediaSessionFactory.createMediaSession();
public void init(final SipServletRequest req) {
...
}
NetworkConnection myNetworkConnection =
public void startDialog() {
myMediaSession.createContainer(NetworkConnectionConfig.c_Basic);
...
}
myMediaGroup =
myMediaSession.createContainer(MediaGroupConfig.c_PlayerSignalDetector);
class CallerPlayerListener implements MediaEventListener<PlayerEvent> {
...
}
MediaEventListener<NetworkConnectionEvent> myNetworkConnectionListener
= new MediaEventListener<NetworkConnectionEvent>() {
class RJDialerSignalDetectorListener
implements MediaEventListener<SignalDetectorEvent> {
... ....
} };
myNetworkConnection.addListener(myNetworkConnectionListener);
void transferDialog(String uri) throws ServletParseException, IOException {
...
} myNetworkConnection.modify(quot;quot;, new String(req.getRawContent()));
}
}
92

93. Call router + Twitter
public class TwitterSIPServletSession {
final SipSession mySipSession;
final SipFactory myFactory;
MediaGroup myMediaGroup;
boolean isRJ = false;
public TwitterSIPServletSession(SipSession aSipSession, SipFactory aFactory) {
...
}
MediaEventListener<NetworkConnectionEvent> myNetworkConnectionListener = new
MediaEventListener<NetworkConnectionEvent>() {
public void init(final SipServletRequest req) {
...
public void onEvent(NetworkConnectionEvent anEvent) {
}
if (NetworkConnectionConstants.ev_Modify.equals(anEvent.getEventID())) {
public void (req.getFrom().getURI().getUser().equals(quot;8312392883quot;)) {
startDialog() {
... if
} isRJ = true;
myMediaGroup.getSignalDetector().addListener(
new RJDialerSignalDetectorListener());
class CallerPlayerListener implements MediaEventListener<PlayerEvent> {
... } else {
}
myMediaGroup.getSignalDetector().addListener(
new CallerPlayerListener());
class RJDialerSignalDetectorListener
implements MediaEventListener<SignalDetectorEvent> {
... }
} myMediaGroup.join(Direction.DUPLEX, myNetworkConnection);
String sdpAnswer = myNetworkConnection.getRawLocalSessionDescription();
void transferDialog(String uri) throws ServletParseException, IOException {
... SipServletMessage msg = req.createResponse(200, quot;OKquot;);
} msg.setContent(sdpAnswer.getBytes(), quot;application/sdpquot;);
}
msg.send();
}
}
};
93

94. Call router + Twitter
public class TwitterSIPServletSession {
final SipSession mySipSession;
final SipFactory myFactory;
MediaGroup myMediaGroup;
boolean isRJ = false;
public TwitterSIPServletSession(SipSession aSipSession, SipFactory aFactory) {
...
}
public void init(final SipServletRequest req) {
...
}
public void startDialog() {
...
}
class CallerPlayerListener implements MediaEventListener<PlayerEvent> {
...
}
class RJDialerSignalDetectorListener
implements MediaEventListener<SignalDetectorEvent> {
...
}
void transferDialog(String uri) throws ServletParseException, IOException {
...
}
}
94

95. Call router + Twitter
public class TwitterSIPServletSession {
final SipSession mySipSession;
final SipFactory myFactory;
MediaGroup myMediaGroup;
public void startDialog() {
boolean isRJ = false;
if (isRJ) {
Parameters collectOptions = mediaSessionFactory.createParameters();
public TwitterSIPServletSession(SipSession aSipSession, SipFactory aFactory) {
... prompt = URI.create(quot;data:application/ssml+xml,quot;+
URI
}
quot;<?xml version=quot;1.0quot;?>quot;+
public void init(final SipServletRequest req) {
... quot;<speak>quot;+
} quot;Welcome RJ. Please enter the phone number you wish to reach.quot;+
quot;</speak>quot;);
public void startDialog() {
collectOptions.put(SignalDetectorConstants.p_Prompt, prompt);
...
} mg.getSignalDetector().receiveSignals(10, null, RTC.bargeIn, collectOptions);
} else {
class CallerPlayerListener twitter_apiMediaEventListener<PlayerEvent> {
net.unto.twitter.Api implements
... = new net.unto.twitter.Api(quot;zscgeekquot;, quot;passwordquot;);
}
URI prompt = URI.create(quot;data:application/ssml+xml,quot;+
class RJDialerSignalDetectorListener
quot;<?xml version=quot;1.0quot;?>quot;+
implements MediaEventListener<SignalDetectorEvent> {
... quot;<speak>quot;+
} quot;Thank you for calling RJ. We will connect you now.quot;+
quot;His twitter status is:quot;+
void transferDialog(String uri) throws ServletParseException, IOException {
... twitter_api.getStatus()+
} quot;</speak>quot;);
}
myMediaGroup.getPlayer().play(prompt, null, null);
}
}
95

96. Call router + Twitter
public class TwitterSIPServletSession {
final SipSession mySipSession;
final SipFactory myFactory;
MediaGroup myMediaGroup;
boolean isRJ = false;
public TwitterSIPServletSession(SipSession aSipSession, SipFactory aFactory) {
...
}
public void init(final SipServletRequest req) {
...
}
public void startDialog() {
...
}
class CallerPlayerListener implements MediaEventListener<PlayerEvent> {
...
}
class RJDialerSignalDetectorListener
implements MediaEventListener<SignalDetectorEvent> {
...
}
void transferDialog(String uri) throws ServletParseException, IOException {
...
}
}
96

97. Call router + Twitter
public class TwitterSIPServletSession {
final SipSession mySipSession;
final SipFactory myFactory;
MediaGroup myMediaGroup;
boolean isRJ = false;
public TwitterSIPServletSession(SipSession aSipSession, SipFactory aFactory) {
...
}
public void init(final SipServletRequest req) {
...
}
public void startDialog() {
...
class CallerPlayerListener implements MediaEventListener<PlayerEvent> {
}
public void onEvent(PlayerEvent anEvent) {
class CallerPlayerListenerquot;+anEvent.getSignalString());
log(quot;Collected: implements MediaEventListener<PlayerEvent> {
...
} MediaSession mediaSession =
anEvent.getSource().getMediaSession().release();
class RJDialerSignalDetectorListener
transferDialog(quot;sip:+18315551234@gateway:5060quot;);
implements MediaEventListener<SignalDetectorEvent> {
...
} }
}
void transferDialog(String uri) throws ServletParseException, IOException {
...
}
}
97

98. Call router + Twitter
public class TwitterSIPServletSession {
final SipSession mySipSession;
final SipFactory myFactory;
MediaGroup myMediaGroup;
boolean isRJ = false;
public TwitterSIPServletSession(SipSession aSipSession, SipFactory aFactory) {
...
}
public void init(final SipServletRequest req) {
...
}
public void startDialog() {
...
}
class CallerPlayerListener implements MediaEventListener<PlayerEvent> {
...
}
class RJDialerSignalDetectorListener
implements MediaEventListener<SignalDetectorEvent> {
...
}
void transferDialog(String uri) throws ServletParseException, IOException {
...
}
}
98

99. Call router + Twitter
public class TwitterSIPServletSession {
final SipSession mySipSession;
final SipFactory myFactory;
MediaGroup myMediaGroup;
boolean isRJ = false;
public TwitterSIPServletSession(SipSession aSipSession, SipFactory aFactory) {
...
}
public void init(final SipServletRequest req) {
...
}
class RJDialerSignalDetectorListener implements
MediaEventListener<SignalDetectorEvent> {
public void startDialog() {
...
} public void onEvent(SignalDetectorEvent anEvent) {
log(quot;Collected: quot;+anEvent.getSignalString());
class CallerPlayerListener implements =
MediaSession mediaSession MediaEventListener<PlayerEvent> {
...
} anEvent.getSource().getMediaSession().release();
transferDialog(quot;sip:quot; + anEvent.getSignalString()
class RJDialerSignalDetectorListener
+ quot;@gateway:5060quot;);
implements MediaEventListener<SignalDetectorEvent> {
...
} }
}
void transferDialog(String uri) throws ServletParseException, IOException {
...
}
}
99

100. Call router + Twitter
public class TwitterSIPServletSession {
final SipSession mySipSession;
final SipFactory myFactory;
MediaGroup myMediaGroup;
boolean isRJ = false;
public TwitterSIPServletSession(SipSession aSipSession, SipFactory aFactory) {
...
}
public void init(final SipServletRequest req) {
...
}
public void startDialog() {
...
}
class CallerPlayerListener implements MediaEventListener<PlayerEvent> {
...
}
class RJDialerSignalDetectorListener
implements MediaEventListener<SignalDetectorEvent> {
...
}
void transferDialog(String uri) throws ServletParseException, IOException {
...
}
}
100

101. Call router + Twitter
public class TwitterSIPServletSession {
final SipSession mySipSession;
final SipFactory myFactory;
MediaGroup myMediaGroup;
boolean isRJ = false;
public TwitterSIPServletSession(SipSession aSipSession, SipFactory aFactory) {
...
}
public void init(final SipServletRequest req) {
...
}
void transferDialog(String uri) {
public void startDialog() request =
SipServletRequest {
...
} myFactory.createRequest(mySipSession.getApplicationSession(),
quot;INVITEquot;,
quot;sip:addressbook@sip-as-uri:5060quot;,
class CallerPlayerListener implements MediaEventListener<PlayerEvent> {
...
} uri);
request.send();
class RJDialerSignalDetectorListener
} implements MediaEventListener<SignalDetectorEvent> {
...
}
void transferDialog(String uri) throws ServletParseException, IOException {
...
}
}
101

102. Call router + Twitter
public class TwitterSIPServletSession {
final SipSession mySipSession;
final SipFactory myFactory;
MediaGroup myMediaGroup;
boolean isRJ = false;
public TwitterSIPServletSession(SipSession aSipSession, SipFactory aFactory) {
...
}
public void init(final SipServletRequest req) {
...
}
public void startDialog() {
...
}
class CallerPlayerListener implements MediaEventListener<PlayerEvent> {
...
}
class RJDialerSignalDetectorListener
implements MediaEventListener<SignalDetectorEvent> {
...
}
void transferDialog(String uri) throws ServletParseException, IOException {
...
}
}
102

103. Made it to the finish line!
103

104. So. We Have Java...
104

105. But is it Simple?
105

106. Is it cool?
106

107. Is It Web 2.0?
107

108. Well Not Exactly...
108

109. So...
109

110. Tropo.com
110

111. answer();
say(quot;Hello, world!quot;);
hangup();
Tropo is Simple
111

112. Ruby
Telephony in YOUR Language
(thanks to the magic of JSR223)
112

113. •! answer
•! redirect •! ask
•! reject •! say •! log
•! record •! wait •! call
•! default •! transfer
•! hangup
Simple to Learn
113

114. •Hosted service
•Accessible via Phone, SIP, Skype etc
•Inbound and Outbound calling
•Free for developers
•No setup costs
•Five minutes from sign-up to live deployment
+ = GO
Simple to Deploy
114

115. What are the Ingredients?
115