Enrico MaroccoResearch Engineer

Realtime Communications, Presence and Instant Messaging:SIP vs. XMPP or SIP and XMPP?

TELECOM ITALIA GROUP

4th Annual Next Generation Mobile MessagingBarcelona, April 2011

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Disclaimer: This is a technology review, do not try to read my company's position in it!

Enrico MaroccoResearch Engineer

Contents‣Background‣What's happening (with no much hype)‣What's next

Extensible Messaging and Presence Protocol (XMPP, aka Jabber)

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Balkanization of the IM landscape: the opensource response

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Meant to Just Work

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Two goals: multi-protocol interoperability and availability

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'X' stands for Extensible

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Great community, efficient standardization process

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RFC 6120, 6121(And 6122, 3923, just updated. And more...)

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Something unexpected happened...

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Session Initiation Protocol (SIP)

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Industry Standard for VoIP...

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… with significant adoption also outside the regular industry

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Everything else you already know

Enrico MaroccoResearch Engineer

Contents‣Background‣What's happening (with no much hype)‣What's next

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VoIP seems a good match for IM+Presence (and vice versa)

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SIMPLE: presence and IM for SIP

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Jingle: VoIP for XMPP

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Issues with SIP/SIMPLE

‣ Interoperability with other

protocols

‣ Poking, inline images,

profile pics...

‣ Scalability

‣ SIP requires ~100 * XMPP

interdomain bandwidth‣ draft-ietf-simple-interdomain-

scaling-analysis

‣ draft-saintandre-xmpp-presence-

analysis

Issues with XMPP/Jingle

‣ NAT/Firewall traversal

‣ Based on client/server

hacks

‣ No middleboxes to rely on

‣ PSTN interoperability

‣ No gateways available

(must use SIP hardware)

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In other words:

‣ SIP, not XMPP/Jingle, is the established standard for VoIP

‣ XMPP, not SIP/SIMPLE, is the established standard for IM+Presence

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A few facts you may have noticed...

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Enrico MaroccoResearch Engineer

Contents‣Background‣What's happening (with no much hype)‣What's next

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There can be only one...

or...

they'd better learn to coexist?

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HTTP vs. Gopher

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SIP vs. H.323

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SMTP + IMAP + POP

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HTTP + FTP

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Gambling Time

SIP vs. XMPP or SIP + XMPP?

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Scenario #1: SIP vs. XMPP

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Network-based interoperability

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Scenario #2: SIP + XMPP

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Integration of your GMail address book in your desktop phone

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Full-featured presence, IM, chatrooms

+ VoIP

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Make your bet!

Followup questions/comments at enrico.marocco@telecomitalia.it