Bridging Multimedia Sessions between SIP and XMPP
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Bridging multimedia sessions between SIP and XMPP
Saúl Ibarra Corretgé | AG ProjectsThursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
Intro
• Hi, I’m Saúl
• @saghul
• Working with VoIP (and beyond!) since Asterisk 1.0
• Happy to be at ClueCon!
Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
• SIP Infrastructure Experts
• SIP Thor: SIP platform with P2P capabilities for horizontal scalability
• Open Source Software Projects
• Blink
• SIP SIMPLE SDK
• SylkServer
• MediaProxy
• OpenXCAP
• MSRPRelay
AG Projects
Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
Understanding SIP and XMPP
• Protocols for negotiation of multimedia sessions, instant messaging and presence
• Same feature set, different design principles
Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
SIP
• Session Initiation Protocol
• Current specification (RFC 3261) in 2002
• Built for establishing multimedia sessions, mainly used in voice, video and conferencing
• Designed to have fat clients and thin servers
Thursday, August 9, 2012
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Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
IM with SIP
Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
Presence with SIP
Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
XMPP
• eXtensible Messaging and Presence Protocol
• Created by the Jabber community in 1999, standardized in 2004 and updated in 2011
• Built for instant messaging and presence, with extensibility in mind
• Designed to have fat servers and thin clients
Thursday, August 9, 2012
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Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
IM with XMPP
Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
Presence with XMPP
Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
Realtime Communications:State of The Art
• SIP used for voice, video, conferencing and PSTN interoperability
• XMPP used for instant messaging and presence
• Ongoing efforts to bring both to web browsers through WebSocket transport for use with WebRTC
GoogleFacebook
^^ BIG XMPP players
Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
Combining SIP and XMPP
• Dual-stack clients: CUSAX
• draft-ivov-xmpp-cusax
• Single-stack clients: use a gateway
• It must be transparent
Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
Going single stack
• Protocol abstractions can lead to problems and limitations
• Simpler provisioning
• SIP and XMPP are different by design, how to marry them?
Thursday, August 9, 2012
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Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
SylkServer
• Open Source SIP Application server
• Zero configuration
• State-of-the-art SIP feature set
• Implemented using SIP SIMPLE SDK
Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
SylkServer Architecture
Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
SylkServer: Applications
• Conference server
• XMPP gateway
Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
SylkServer: Conferencing
• HD audio
• MSRP chat
• Participants list (RFC 4575)
• Conference control (RFC 4579)
• File transfer
• Screen sharing
Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
SylkServer: XMPP gateway
• Chat (SIP MESSAGE and MSRP)
• Presence
• MUC server
Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
SylkServer: XMPP gateway design
• SylkServer acts as a stand-alone XMPP Server
• It only supports S2S connections
• Users are on the SIP side, no XMPP clients allowed to register on SylkServer ZERO conf!
Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
SylkServer: XMPP gateway architecture
Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
Implementation challenges
• XMPP server vs XMPP component
• Loose / incomplete specifications
• Concept mismatch
• XMPP “sessions”
• SIP PIDF vs XMPP presence stanza
• Different feature set
• SIP conferencing vs MUC
Thursday, August 9, 2012
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Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
Future
• IETF is considering resurrecting theSIP-XMPP interoperability drafts!
• SylkServer roadmap
• Jingle
• File transfer
Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
Thursday, August 9, 2012
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AG ProjectsSIP Infrastructure Experts
BYE sip:audience@ClueCon2012 SIP/2.0Via: SIP/2.0/UDP 192.168.99.23:49919;rport;branch=z9hG4bKPjDb30Dx0sH7aMMax-Forwards: 70From: "saghul" <sip:[email protected]>;tag=UCpGKVZbQQx7BUKTo: <sip:audience@ClueCon2012>;tag=as59aef35cCall-ID: DEWDfu63OACwYeQk7MrhmRhRq.1cqqisCSeq: 10633 BYERoute: <sip:81.23.228.129;lr;ftag=UCpGKVZbQQx7BUKY;did=641.a8a9c553>User-Agent: BlinkContent-Length: 0
@saghul
Thursday, August 9, 2012