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COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED.
WebRTC Best Practices
Chad Hart
COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED. 2
PowerMedia™ XMS
Multi-party mixing InterworkingTranscoding
Stream processing Person-to-machineRecording
Current & Emerging WebRTC Media Processing Needs
COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED. 3
PowerMedia™ XMS
Back-end Web Developers
Telephony Developers
Enterprise Developers
Standard Media ServerInterfaces
RESTful APIs
API’s and Interfaces for Media Developers
COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED. 4
We help with traditional media processing too
Mixing/MCURecording/Playback
Call Progress AnalysisText-to-Speech
Automatic Speech RecognitionWhisper mode
High Availability…
COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED. 5
Agenda
Interoperability & InterworkingGatewaysReal WebRTC networksTough choicesCase study - WebRTC solves real problems todayWhat you should really be working on
COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED. 6
Interoperability – Browser to Browser
Instigators
• Version differences• Vendor implementation timelines• Homebuilt implementations• New browser introductions
(hopefully!)
API’s• Need: Medium• Difficulty: Low to High• Resolution: JS Shim, use Chrome
Media• Need: Low• Difficulty: High• Resolution: use Chrome
COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED. 7
Interoperability – Browser to Phone
Instigators• SIP complexity• Lack of standards to do this (of
course they are coming)
Signaling• Need: Low to High• Difficulty: Medium to High• Resolution: H2S Gateway, Telco
SHIM APIs
Media• Need: Low to High• Difficulty: Low to High• Resolution: Media GW,
Transcoding
COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED. 8
“Legacy” Telephony Interworking Functions
HTTP-to-SIP(H2S)
Media GW
Transcoder
NetworkWebRTC Users Phone User
User-defined Signaling
WS/COMET/BOSH
SRTP-DTLS
UDP/TCP
SIP
RTP/SRTP-SDES
UDP
OPUS/VP8 G.7XX/H.264
COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED. 9
Many Packaging Options
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
COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED. 10
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
Enterprise SIP
Application specific APIs work best SIP is not really that standard
COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED. 11
HTTP-to-SIP (H2S) Requirements are not Uniform
H2S
Media GW
Transcoder
NetworkWebRTC Users Phone User
Web Signaling
SRTP-DTLS
UDP/TCP
RTP/SRTP-SDES
UDP
OPUS/VP8 G.7XX/H.264
H2S
H2SSIP
H2S
Control Interfaces
COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED. 12
Scope 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
Security Functions
API Management
Session Border ControlFirewalls
COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED. 13
Basic, Telco-Centric Model
Web server
SBC
SIP/IMS Network
SIP
Javascript App
H2S
Signaling
WebMG
SRTP
RTP
SIP
RTP
Firewall
COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED. 14
Mature, Web-Centric Model
Web server
SIP/IMS Network
SIP
JS App
Signaling
WebMG
SRTP RTP
Firewall
API M
anag
er
API Calls
H2S Server
Identity Server
App Server
App Server
WSS server
STUN/ TURN
Internal REST APIs
COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED. 15
Design Trade-offs
Application Performance
Server Performance
Client Performance
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When does media control matter?
When there is limited bandwidth
When the user is paying per GB
When battery usage is a factor
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Case Study – the Airline
17
TravelAgent
TravelAgent
TravelAgent
COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED. 18
Case Study – the Airline
18
TravelAgent
TravelAgent
TravelAgent
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
COMPANY CONFIDENTIAL © COPYRIGHT 2013 DIALOGIC INC. ALL RIGHTS RESERVED. 19
What Smarter People Are Doing
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Contact me
Chad Hartlinkedin.com/in/[email protected]@chadwallacehart
webrtcHacks.com@webrtcHacks
