This document discusses peer-to-peer vs peer-to-server approaches in WebRTC. Peer-to-server offers benefits like improved performance and reduced infrastructure costs but at the cost of lower client performance. It suggests server-side WebRTC makes sense for limited bandwidth, expensive bandwidth, or power limitations. It also describes Dialogic's PowerMedia XMS platform for WebRTC media processing and real-time communications applications. Case studies show how it has been used to enable video in contact centers and improve mobile experiences.

1. COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED.
Peer-to-Server Media in
WebRTC
Chad Hart
Enterprise Connect 2014

2. COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED. 2
Peer-to-Peer vs. Peer-to-Server
client client
Media Server
Signaling
Server
Peer-to-Server
Server
client client
media
Peer-to-Peer

3. COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED. 3
Design Trade-offs – Cost vs. Performance vs. Location
Application
Performance
Server
Performance
Client
Performance
Higher
infrastructure
costs
Battery life
Speed
Quality
expectations

4. COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED. 4
When does server-side WebRTC make sense?
Limited
bandwidth
Expensive
bandwidth
Power
limitations
Regulatory
requirements

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PowerMedia™ XMS
Multi-party mixing InterworkingTranscoding
Stream processing Person-to-machineRecording
WebRTC Media Processing Use Cases

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Case Study – the Airline
6

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Video-enabling a Contact Center
Web App
Server
Media
Control
HTTP/
REST
Media
Interface
SBC Media Server
RTP
Contact Center
SRTP
PSTN
PSTN Customers
Agents
ACD
Kiosk Customer
RTP
SIP
HTTP/
REST

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Case Study – the Airline
8
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 variable cloud latencies

9. 192.168.1.122
Kindle Fire HDX
RFC576
6-TURN-
Server
ec2-54-227-235-160.compute-1.amazonaws.com
SBC?
na4.edge-gacd.amazon.com
Web
Signalin
g
Kconnect-us.amazon.com
Amazon Kindle HDX Mayday
button Wireshark trace
http://webrtchacks.com/mayday-trace/

10. 192.168.1.122
Kindle Fire HDX
RFC576
6-TURN-
Server
ec2-54-227-235-160.compute-1.amazonaws.com
SBC?
na4.edge-gacd.amazon.com
Web
Signalin
g
Kconnect-us.amazon.com
Amazon Kindle HDX Mayday
button Wireshark trace
http://webrtchacks.com/mayday-trace/

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PowerMedia XMS
Virtualized
Cloud-ready
Audio
Video
WebRTC
Robust
Developer APIs
Standardized
Production
Interfaces
real-time media processing platform

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SIP Web Java Speech
Audio Video WebRTC CPA
PowerMedia™ XMS
Media Platform for Developers & IT
RESTful
Java (JSR.309)
VXML
MSML
NETANN
MRCPv2
Javascript
PowerfulMediaAPIs
PowerMedia XMS
Diverse Developer Audiences
Extensive Capabilities

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WebRTC Gateways

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

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WebRTC Gateways Come in Many Packages
HTTP-to-SIP
(H2S)
Media GW
Transcoder
HTTP-to-SIP
(H2S)
Media GW
Transcoder
HTTP-to-SIP
(H2S)
Media GW
Transcoder
HTTP-to-SIP
(H2S)
Media GW
Transcoder

16. COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED. 16
Will One H2S Gateway be Sufficient?
Retail Click-to-Call
Enterprise Click-to-Call
Residential Web Phone
RCS Web Client
Developer API exposure
Remote Agent
Remote Worker
HTTP-to-SIP
(H2S)
IMS/RCS
RFC3261 SIP
Microsoft SIP
Application specific APIs work best SIP is sort-of standard

17. COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED. 17
Media Requirements More Uniform than H2S
H2S
Media GW
Transcoder
NetworkWebRTC Users Phone Users
Web Signaling
SRTP-DTLS
UDP/TCP
RTP/SRTP-SDES
UDP
OPUS/VP8 G.7XX/H.264
H2S
H2S
SIP
H2S
Control Interfaces