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Bridging multimedia sessionsbetween SIP and XMPP
Sal Ibarra Corretg |AG ProjectsThursday, August 9, 2012
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Intro
Hi, Im Sal
@saghul
Working with VoIP (and beyond!) sinceAsterisk 1.0
Happy to be at ClueCon!
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AG ProjectsSIP Infrastructure Experts
SIP InfrastructureExperts
SIP Thor: SIP platformwith P2P capabilitiesfor horizontalscalability
Open Source Software
Projects
Blink
SIP SIMPLE SDK
SylkServer
MediaProxy
OpenXCAP
MSRPRelay
AG Projects
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UnderstandingSIP and XMPP
Protocols for negotiation of multimediasessions, instant messaging and presence
Same feature set, different design principles
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SIP
Session Initiation Protocol
Current specification (RFC 3261) in 2002
Built for establishing multimedia sessions,mainly used in voice, video andconferencing
Designed to have fat clients and thinservers
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IM with SIP
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Presence with SIP
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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 thinclients
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IM with XMPP
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Presence with XMPP
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Realtime Communications:
State of The Art
SIP used for voice, video, conferencing andPSTN interoperability
XMPP used for instant messaging andpresence
Ongoing efforts to bring both to webbrowsers through WebSocket transport foruse with WebRTC
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Combining SIP and XMPP
Dual-stack clients: CUSAX
draft-ivov-xmpp-cusax
Single-stack clients: use a gateway
It must be transparent
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Going single stack
Protocol abstractions can lead to problems
and limitations
Simpler provisioning
SIP and XMPP are different by design, howto marry them?
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SylkServer
Open Source SIP Application server
Zero configuration
State-of-the-art SIP feature set
Implemented using SIP SIMPLE SDK
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SylkServer Architecture
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SylkServer: Applications
Conference server
XMPP gateway
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SylkServer: Conferencing HD audio
MSRP chat
Participants list (RFC 4575)
Conference control (RFC 4579)
File transfer
Screen sharing
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SylkServer: XMPP gateway
Chat (SIP MESSAGE and MSRP)
Presence
MUC server
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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 clientsallowed to register on SylkServer
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SylkServer: XMPP gateway architecture
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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
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Future
IETF is considering resurrecting the
SIP-XMPP interoperability drafts!
SylkServer roadmap
Jingle
File transfer
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BYE sip:audience@ClueCon2012 SIP/2.0Via: SIP/2.0/UDP 192.168.99.23:49919;rport;branch=z9hG4bKPjDb30Dx0sH7aMMax-Forwards: 70
From: "saghul" ;tag=UCpGKVZbQQx7BUKTo: ;tag=as59aef35cCall-ID: DEWDfu63OACwYeQk7MrhmRhRq.1cqqisCSeq: 10633 BYERoute: User-Agent: Blink
Content-Length: 0
@saghul
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