Chad's presentation from the WebRTC Paris show covering interoperability issues, WebRTC gateway trends, WebRTC security models, server-side media processing, a video kiosk case study, and future WebRTC applications

1. WebRTC Best Practices
Chad Hart
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2. Current & Emerging WebRTC Media Processing Needs
Multi-party mixing
Transcoding
Interworking
Recording
Stream processing
Person-to-machine
PowerMedia™ XMS
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3. API’s and Interfaces for Media Developers
Telephony
Developers
Enterprise
Developers
Standard Media Server
Interfaces
Back-end Web
Developers
RESTful
APIs
PowerMedia™ XMS
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4. We help with traditional media processing too
Mixing/MCU
Recording/Playback
Call Progress Analysis
Text-to-Speech
Automatic Speech Recognition
Whisper mode
High Availability
…
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5. Agenda
Interoperability & Interworking
Gateways
Real WebRTC networks
Tough choices
Case study - WebRTC solves real problems today
What you should really be working on
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6. Interoperability – Browser to Browser
•
•
Instigators •
•
Version differences
Vendor implementation timelines
Homebuilt implementations
New browser introductions
(hopefully!)
API’s
Media
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• Need: Medium
• Difficulty: Low to High
• Resolution: JS Shim, use Chrome
• Need: Low
• Difficulty: High
• Resolution: use Chrome
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7. Interoperability – Browser to Phone
• SIP complexity
Instigators • Lack of standards to do this (of
course they are coming)
Signaling
Media
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• Need: Low to High
• Difficulty: Medium to High
• Resolution: H2S Gateway, Telco
SHIM APIs
• Need: Low to High
• Difficulty: Low to High
• Resolution: Media GW,
Transcoding

8. “Legacy” Telephony Interworking Functions
WebRTC Users
Phone User
Network
HTTP-to-SIP
(H2S)
SRTP-DTLS
UDP/TCP
Media GW
G.7XX/H.264
OPUS/VP8
Transcoder
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RTP/SRTP-SDES
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UDP

9. Many Packaging Options
HTTP-to-SIP
(H2S)
Media GW
Transcoder
HTTP-to-SIP
(H2S)
HTTP-to-SIP
(H2S)
Media GW
Media GW
Transcoder
Transcoder
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HTTP-to-SIP
(H2S)
Media GW
Transcoder

10. Will One H2S Gateway be Sufficient?
Application specific APIs work best
SIP is not really that standard
Retail Click-to-Call
Enterprise Click-to-Call
Residential Web Phone
RCS Web Client
HTTP-to-SIP
(H2S)
Developer API exposure
RFC3261 SIP
Enterprise SIP
Remote Agent
Remote Worker
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IMS/RCS
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11. HTTP-to-SIP (H2S) Requirements are not Uniform
WebRTC Users
Phone User
Network
H2S
H2S
H2S
Web Signaling
H2S
SIP
Control Interfaces
SRTP-DTLS
UDP/TCP
Media GW
G.7XX/H.264
OPUS/VP8
Transcoder
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RTP/SRTP-SDES
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UDP

12. Security Functions
Firewalls
API
Management
Session Border
Control
All Traffic
APIs
VoIP Traffic
Identifier
Address:Port
API Key
Phone #, URI
Controls
Bandwidth, Address,
Ports
API Calls
VoIP Messages,
Bandwidth, Ports
Topology
Hiding
No
N/A
Yes
Scope
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13. Basic, Telco-Centric Model
Javascript
App
Web
server
SIP/IMS
Network
SIP
H2S
Firewall
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SIP
WebMG
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SBC
RTP

14. Mature, Web-Centric Model
Web
server
Identity
Server
Internal
REST APIs
API Calls
WSS
server
API Manager
App
Server
STUN/
TURN
Firewall
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App
Server
H2S
Server
WebMG
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SIP/IMS
Network
SIP

15. Design Trade-offs
Application
Performance
Client
Performance
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Server
Performance
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16. When does media control matter?
When there is
limited bandwidth
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When the user is
paying per GB
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When battery
usage is a factor

17. Case Study – the Airline
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18. Case Study – the Airline
Lessons Learned:
• Applications are viable today when you have
end-to-end control
• Leveraging existing infrastructure shortens
time-to-market
• Assume you will have poor connectivity
• Be careful with the cloud
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19. What Smarter People Are Doing
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20. Contact me
Chad Hart
linkedin.com/in/chadwallacehart
chad.hart@dialogic.com
@chadwallacehart
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webrtcHacks.com
@webrtcHacks
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