[Sip] Support for Multipart/MIME
Cullen Jennings <fluffy@cisco.com> Mon, 30 April 2007 05:05 UTC
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From: Cullen Jennings <fluffy@cisco.com>
Date: Sun, 29 Apr 2007 22:04:45 -0700
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Subject: [Sip] Support for Multipart/MIME
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The extensibility model of SIP and SDP is very powerful in most ways. It is often done by adding a new thing and if both sides understand it, they use it, and if they don't understand it, they use the other data in the messages that they both do understand and "fall back" to the old behavior. We can do this for headers, URI, and other places in SIP. We can do if for SDP attributes. However, there is one place were SIP is very lacking in it's ability to be upgraded in the future. This is around body extensibility. The typical way to deal with extensibility of bodies is using MIME multipart. This allows a SIP message to cary more than one body and the receiver to select and use whichever ones it understands - This is all defined for sip except for one problem. It was not mandatory to implement and as you can see from the stats below, lots of UAs don't implement it. I believe that sooner or later we will have to do this - it's pretty trivial to implement support for receiving multipart even if SDP is the only thing your UA knows how to handle. Now we could argue about if emergency calls were the thing that absolutely required us to do this but my point is sooner or later we are going to need to deal with this - it has come up many times in the past. I suspect it will only get more difficult over time to make this change. I think the WG should consider an update to 3261 (likely done through the process Keith has proposed) that makes this multipart/MIME mandatory to implement. Cullen On Apr 27, 2007, at 11:48 AM, Brian Rosen wrote: > I'd like to point out one thing about this: > >> This is how they answered for multipart/mime: >> 2% I break if someone sends me multipart/mime >> 24% I pretend multipart/mime doesn't exist if someone sends it >> to me >> 24% I ignore multipart/mime but will proxy it or hand it to my >> application if it shows up >> 10% I try to do something useful with multipart/mime I receive, >> but I never send it >> 4% I ignore multipart/mime that I receive, but I try to do >> something useful with multipart/mime I send >> 24% I try to do something useful with multipart/mime I send and >> receive >> 12% Other > > Moving forward, SIP UAs and proxies will be required to support > location-conveyance (currently draft-ietf-sip-location- > conveyance-07) in > order to support location for emergency calls (citizen to > authority, like > 1-1-2 or > 9-1-1). -conveyance requires multipart support. > > The consequences of not supporting emergency call location will be > serious. > I believe it is likely that there will eventually be regulatory > requirements > to support emergency calls in some jurisdictions. Upgrades to several > components of today's infrastructure will be needed before this all > works, > but stack vendors and UA developers should put multipart (and > location-conveyance) on their development plans for next year at > the latest. > > Brian _______________________________________________ Sip mailing list https://www1.ietf.org/mailman/listinfo/sip This list is for NEW development of the core SIP Protocol Use sip-implementors@cs.columbia.edu for questions on current sip Use sipping@ietf.org for new developments on the application of sip
- Re: [Sip] SIPit 20 survey summary Frank W. Miller
- [Sip] SIPit 20 survey summary Robert Sparks
- [Sip] Which sip.instance to use (GRUU and Outboun… Jerry Yin
- Re: [Sip] SIPit 20 survey summary Jeroen van Bemmel
- Re: [Sip] SIPit 20 survey summary Juha Heinanen
- RE: [Sip] SIPit 20 survey summary Brian Rosen
- Re: [Sip-implementors] [Sip] SIPit 20 survey summ… Mark R. Lindsey
- Re: [Sip-implementors] [Sip] SIPit 20 survey summ… Juha Heinanen
- Re: [Sip] SIPit 20 survey summary Cullen Jennings
- Re: [Sip] SIPit 20 survey summary Frank W. Miller
- Re: [Sip] SIPit 20 survey summary Cullen Jennings
- Re: [Sip-implementors] [Sip] SIPit 20 survey summ… Mark R. Lindsey
- Re: [Sip-implementors] [Sip] SIPit 20 survey summ… Juha Heinanen
- Re: [Sip] SIPit 20 survey summary Hannes Tschofenig
- Re: [Sip] SIPit 20 survey summary Jeroen van Bemmel
- Re: [Sip] SIPit 20 survey summary Henning Schulzrinne
- Re: [Sip] SIPit 20 survey summary Juha Heinanen
- Re: [Sip] SIPit 20 survey summary Hannes Tschofenig
- Re: [Sip] SIPit 20 survey summary Hannes Tschofenig
- Re: [Sip-implementors] [Sip] SIPit 20 survey summ… Scott Lawrence
- Re: [Sip] SIPit 20 survey summary Frank W. Miller
- Re: [Sip] SIPit 20 survey summary Juha Heinanen
- Re: [Sip] SIPit 20 survey summary Henning Schulzrinne
- Re: [Sip] SIPit 20 survey summary Henning Schulzrinne
- Re: [Sip] SIPit 20 survey summary Hannes Tschofenig
- Re: [Sip] SIPit 20 survey summary Hannes Tschofenig
- Re: [Sip] SIPit 20 survey summary Hannes Tschofenig
- Re: [Sip-implementors] [Sip] SIPit 20 survey summ… Jeroen van Bemmel
- Re: [Sip-implementors] [Sip] SIPit 20 survey summ… Hannes Tschofenig
- Re: [Sip-implementors] [Sip] SIPit 20 survey summ… Jeroen van Bemmel
- [Sip] geoloc implementation (Was: SIPit 20 survey… Dale.Worley
- Re: [Sip] geoloc implementation (Was: SIPit 20 su… Paul Kyzivat
- [Sip] Support for Multipart/MIME Cullen Jennings
- Re: [Sip] geoloc implementation (Was: SIPit 20 su… Juha Heinanen
- RE: [Sip] geoloc implementation (Was: SIPit 20 su… Brian Rosen
- Re: [Sip] Support for Multipart/MIME Dale.Worley
- Re: [Sip] Support for Multipart/MIME Paul Kyzivat
- Re: [Sip] Support for Multipart/MIME Frank W. Miller
- RE: [Sip] Support for Multipart/MIME Francois Audet
- RE: [Sip] Support for Multipart/MIME James M. Polk
- RE: [Sip] Support for Multipart/MIME Christer Holmberg (JO/LMF)
- RE: [Sip] Support for Multipart/MIME Dan Wing
- Re: [Sip] Support for Multipart/MIME Paul Kyzivat
- RE: [Sip] Support for Multipart/MIME James M. Polk
- RE: [Sip] Support for Multipart/MIME Dan Wing
- RE: [Sip] Support for Multipart/MIME Ted Hardie
- Re: [Sip] Support for Multipart/MIME Dean Willis
- RE: [Sip] Support for Multipart/MIME Dan Wing
- RE: [Sip] Support for Multipart/MIME Ted Hardie
- Re: [Sip] Support for Multipart/MIME Paul Kyzivat
- RE: [Sip] Support for Multipart/MIME Dan Wing
- Re: [Sip] Support for Multipart/MIME Paul Kyzivat
- RE: [Sip] Support for Multipart/MIME Christer Holmberg (JO/LMF)
- RE: [Sip] Support for Multipart/MIME Dan Wing
- RE: [Sip] Support for Multipart/MIME Christer Holmberg (JO/LMF)
- Re: [Sip] Support for Multipart/MIME Dean Willis
- RE: [Sip] Support for Multipart/MIME Dan Wing
- Re: [Sip] Support for Multipart/MIME Ted Hardie
- RE: [Sip] Support for Multipart/MIME Christer Holmberg (JO/LMF)
- RE: [Sip] Support for Multipart/MIME Dan Wing
- RE: [Sip] Support for Multipart/MIME Christer Holmberg (JO/LMF)
- RE: [Sip] Support for Multipart/MIME Christer Holmberg (JO/LMF)
- RE: [Sip] Support for Multipart/MIME Dan Wing
- RE: [Sip] Support for Multipart/MIME Christer Holmberg (JO/LMF)
- RE: [Sip] Support for Multipart/MIME Dan Wing
- Re: [Sip] Support for Multipart/MIME Paul Kyzivat
- RE: [Sip] Support for Multipart/MIME Francois Audet
- RE: [Sip] Support for Multipart/MIME Christer Holmberg (JO/LMF)
- Re: [Sip] Support for Multipart/MIME Paul Kyzivat
- RE: [Sip] Support for Multipart/MIME Dan Wing
- RE: [Sip] Support for Multipart/MIME Christer Holmberg (JO/LMF)
- RE: [Sip] Support for Multipart/MIME Dan Wing
- RE: [Sip] Support for Multipart/MIME Christer Holmberg (JO/LMF)
- Re: [Sip] Support for Multipart/MIME Paul Kyzivat
- RE: [Sip] Support for Multipart/MIME Dan Wing
- RE: [Sip] Support for Multipart/MIME Christer Holmberg (JO/LMF)
- RE: [Sip] Support for Multipart/MIME Christer Holmberg (JO/LMF)
- RE: [Sip] Support for Multipart/MIME Dan Wing
- Re: [Sip] Support for Multipart/MIME Paul Kyzivat
- Re: [Sip] Support for Multipart/MIME Paul Kyzivat
- RE: [Sip] Support for Multipart/MIME Francois Audet
- RE: [Sip] Support for Multipart/MIME Francois Audet
- RE: [Sip] Support for Multipart/MIME Dan Wing
- RE: [Sip] Support for Multipart/MIME Francois Audet
- Re: [Sip] Support for Multipart/MIME Cullen Jennings
- RE: [Sip] Support for Multipart/MIME Christer Holmberg (JO/LMF)
- Re: [Sip-implementors] [Sip] SIPit 20 survey summ… Klaus Darilion
- Re: [Sip-implementors] [Sip] SIPit 20 survey summ… Hannes Tschofenig
- Re: [Sip-implementors] [Sip] SIPit 20 survey summ… Dale.Worley
- RE: [Sip] Support for Multipart/MIME Francois Audet
- Re: [Sip] Support for Multipart/MIME Gonzalo Camarillo
- Re: [Sip] Support for Multipart/MIME Gonzalo Camarillo
- Re: [Sip] Support for Multipart/MIME Gonzalo Camarillo
- Re: [Sip] Support for Multipart/MIME Paul Kyzivat
- RE: [Sip] Support for Multipart/MIME Francois Audet
- RE: [Sip] Support for Multipart/MIME Francois Audet
- Re: [Sip] Support for Multipart/MIME Paul Kyzivat
- Re: [Sip] Support for Multipart/MIME Gonzalo Camarillo
- Re: [Sip] Support for Multipart/MIME Paul Kyzivat
- Re: [Sip] Support for Multipart/MIME Paul Kyzivat
- RE: [Sip] Support for Multipart/MIME Francois Audet
- Re: [Sip] Support for Multipart/MIME Paul Kyzivat
- RE: [Sip] Support for Multipart/MIME Dan Wing
- RE: [Sip] Support for Multipart/MIME Francois Audet
- RE: [Sip] Support for Multipart/MIME Francois Audet
- RE: [Sip] Support for Multipart/MIME Dan Wing
- RE: [Sip] Support for Multipart/MIME Dan Wing
- RE: [Sip] Support for Multipart/MIME Francois Audet
- RE: [Sip] Support for Multipart/MIME Elwell, John
- Re: [Sip] Support for Multipart/MIME Gonzalo Camarillo
- Re: [Sip] Support for Multipart/MIME Gonzalo Camarillo
- Re: [Sip] Support for Multipart/MIME Gonzalo Camarillo
- Re: [Sip] Support for Multipart/MIME Paul Kyzivat
- RE: [Sip] Support for Multipart/MIME - order of b… Christer Holmberg (JO/LMF)
- RE: [Sip] Support for Multipart/MIME Christer Holmberg (JO/LMF)
- RE: [Sip] Support for Multipart/MIME - order of b… Francois Audet
- RE: [Sip] Support for Multipart/MIME - order of b… Christer Holmberg (JO/LMF)
- Re: [Sip] Support for Multipart/MIME Gonzalo Camarillo
- Re: [Sip] Support for Multipart/MIME Paul Kyzivat
- RE: [Sip] Support for Multipart/MIME - S/MIME Christer Holmberg (JO/LMF)
- RE: [Sip] Support for Multipart/MIME - support of… Christer Holmberg (JO/LMF)
- Re: [Sip] Support for Multipart/MIME - support of… Gonzalo Camarillo
- RE: [Sip] Support for Multipart/MIME - support of… Christer Holmberg (JO/LMF)
- Re: [Sip] Support for Multipart/MIME - support of… Paul Kyzivat
- RE: [Sip] Support for Multipart/MIME Dan Wing
- RE: [Sip] Support for Multipart/MIME Dan Wing
- RE: [Sip] Support for Multipart/MIME - when is it… Christer Holmberg (JO/LMF)
- RE: [Sip] Support for Multipart/MIME - support of… Christer Holmberg (JO/LMF)
- Re: [Sip] Support for Multipart/MIME Gonzalo Camarillo
- RE: [Sip] Support for Multipart/MIME Dan Wing
- Re: [Sip] Support for Multipart/MIME Paul Kyzivat
- Re: [Sip] Support for Multipart/MIME Cullen Jennings