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UA Loose Routing

UA Loose Routing. Jonathan Rosenberg Cisco Systems. UA wants to add a cookie to its URI AOR or GRUU Hand out that URI with the cookie When it is dereferenced, incoming request conveys cookie. Problem Statement. INV. 200. K:gruu+cookie. REFER Gruu+cookie.

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UA Loose Routing

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  1. UA Loose Routing Jonathan Rosenberg Cisco Systems

  2. UA wants to add a cookie to its URI AOR or GRUU Hand out that URI with the cookie When it is dereferenced, incoming request conveys cookie Problem Statement INV 200 K:gruu+cookie REFER Gruu+cookie

  3. Basic Idea: home proxy doesn’t rewrite Request-URI, instead pushes Route with registered contact Preserves the original URI and any parameters Proposed Mechanism REGISTER To: sip:joe@example.com K: sip:1.2.3.4 INV sip:joe@example.com; Cookie=asdasd INV sip:joe@example.com; Cookie=asdasd Route: sip:1.2.3.4 UAS proxy

  4. Determining the Alias by which a UA is reached P-Called-Party-ID Limited Use Addresses Sub-Addressing Service Interaction RFC 3087, IVR SIP, Voicemail URI Emergency Services Marking Freephone numbers Additional Problems Solved

  5. Issues • Backwards compatibility • Draft proposes Supported/Require in REGISTER • Should work fine, but what about proxies? • Redirection • Need to differentiate three cases • Recurse by R-URI modification • Recurse by replacing top Route • Recurse by appending top Route • Propose Via param to indicate capability and ;lr flag to differentiate cases • Other routing services?

  6. Questions • Adopt as WG item?

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