1. EPABX (ELECTRONICS PRIVATE AUTOMATIC BRANCH
EXCHANGE)

2. CONTENTS
 INTRODUCTION
 ADVANCEMENTS IN PBX
 CENTREX SERVICES
 TYPES OF EPABX
 VOIP
 PSTN & ISDN
 CALL BIILING SOFTWARE
 CALL LOGGING
 CALL SIGNALLING
 ADVANTAGES
 DISADVANTAGES
 APPLICATIONS

3. WHAT IS EPABX & WHY IT IS
NEEDED?
A Switching system
Knowledge of traffic
pattern
Efficient in offices

4. ADVANCEMENTS IN PBX
Auto conferencing
Automatic
redialing of
numbers
Call transferring &
call forwarding
Auto attendant
Inbuilt paging

5. CENTREX SERVICES
 EPSCS facility
 Trunk level interconnection

6. PBX TIE TRUNK HIERARCHY
 Interconnection through switches
 HU

7. SATELLITE TIE TRUNKS
 Used in campus
 HDLC protocol

8. IMPLEMENTATION OF EPABX
 Multiple line extensions

9. TYPES OF EPABX SYSTEMS
Analog PBX
Digital PBX

10. IP EPABX
 Network card interface
 Multiple simultaneous calls
 VOIP tech.

11. HYBRID EPABX
Digital PBX with IP PBX
capabilities
Without network chip
Service provider: Toshiba,
Inter-Tel & Mitel
Without network chip

12. HYBRID EPABX

13. DIGITAL EPABX
Call &
Auto trunk
attendant budgeting
CLI based Least call
routing routing

14. DIGITAL EPABX

15. ANALOG EPABX
Auto fax
detection
Backup
Restricted Call billing
& denied & call
dialing budgeting
Remote
DID
paging

16. IP PBX
Single network
for voice &
data.
Interactive Reduction in
voice expenses
response.
Function: work
Conferencing as a software
system
Control of live
calls

17. IP PBX
 Features:
 Unlimited extensions
 Unlimited auto attendants

18. VOIP
Voice
communication
Protocols
SDP
used:
RTI H.323
SIP MGCP

19. VOIP

20. PSTN & MOBILE N/W PROVIDERS
 IP backhaul
 Corporate use

21. HISTORICAL MILESTONES
 1974: IEEE published a paper
 1985: creation of NSFNET.
 1994: invention of VOIP
 1995: Standardization for VOIP
 1996: Voice comm.
 1993: First soft switch
 1999: Open source PBX
 2004: VOIP service providers proliferate.

22. PSTN
 Consists of Fiber optic cables , telephone
lines etc.
 Single address space
 Single numbering plan

23. ISDN
 Simultaneous digital transmission
 Integration

24. CALL BILLING SOFTWARE
 User wise rights declaration
 Party maintenance
 Extension details
 Security
 Scanned registration forms
 Shifting
 Reprocess calls

25. AREA WISE CALL DETAIL

26. CALL ACCOUNTING SYSTEM
 Records events
 Detection of calls
 Call logging

27. WORKING OF CALL ACCOUNTING
 Collects data
 Attachment of revenues
 Sends information
 Storage of data
 Collection of voice data

28. CALL LOGGING
 Collection of phone call data
 CDR data
 To generate geographical reports

29. CALL SIGNALLING
 To set up a connection
 Authentication
 Minimization of risks

30. ADVANTAGES OF EPABX
 Cost reduction
 Predetermination of calls
 Software accomplishment
 Portability
 Flexibility

31. DISADVANTAGES OF EPABX
 Needs electric power
 Low installation & configuration
 Increase in long distance charges
 Low mobile workforce

32. APPLICATIONS
 Call center
 Computer support center
 IT response center
 Technical support center
 Information center
 Resource center

33. FUTURE SCOPE
 Include VOIP PBX
 Additional features

34. CONCLUSION
 A modern PBX from the equipment point of view , is much
simpler then the older electromechanical systems . Most of its
sophistication is built inside the chips that actually carry
outside the work. The switching matrix tends to be quite small
,& new opportunities are available for convenient design of
user terminals. Trunk circuits, going mostly to obsolete (2-wire
analog) central offices and to analog long-haul tie-trunks, still
have to meet the outside world on its own terms, but even
they, while they are still with us, take advantage of PBX control
and component sophistication. Fortunately, new standards may
soon let us leave the analog world behind.