Re: [martini] Announcement of MARTINI WG last Call on "Registration for Multiple Phone Numbers in the SIP"
Adam Roach <adam@nostrum.com> Sat, 24 July 2010 09:55 UTC
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Date: Sat, 24 Jul 2010 11:56:10 +0200
From: Adam Roach <adam@nostrum.com>
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Cc: Bernard Aboba <bernard_aboba@hotmail.com>, "martini@ietf.org" <martini@ietf.org>
Subject: Re: [martini] Announcement of MARTINI WG last Call on "Registration for Multiple Phone Numbers in the SIP"
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> -------------------------------------------------------------- > > Issue-2: How does a SIP-PBX that doesn't have SIP endpoints respond to a SUBSCRIBE to reg-event (say, SIP-PBX supports only analog or H.323 lines)? I assume it should create fake registration data is if the target AOR were registered to a SIP endpoint. Does that need to be stated? You've described pretty much the correct behavior. I'm not certain we need to have a lot of discussion about this, although a one-sentence summary (similar to what you've put above) probably has some value. > -------------------------------------------------------------- > > Issue-3: > Section 5.2 says... > A further implication of this property is that an individual extension > that is implicitly registered may also be explicitly registered using > a normal, non-bulk registration (subject to SSP policy). If such a > registration exists, it is refreshed independently of the bulk > registration, and is not removed when the bulk registration is > removed. > > I assume this means that an enterprise user AOR can be bound to two (multiple) contact addresses; one bulk-registered by the PBX, and a second explicitly registered by a SIP endpoint directly hosted by the SSP network. > > Section 6 of the draft goes on to say that SUBSCRIBE requests to reg-event are handled just like INVITE requests, which means that if the target AOR has multiple contacts, the SUBSCRIBE request is forked. This seems like a problem, since RFC3680 disallows forking (RFC3680 section 4.9). Yeah, I've always considered event packages that forbid multiple subscriptions in the case of a forked SUBSCRIBE to indicate a lack of imagination on behalf of the event package designer. :) Basically, the only way to make this work properly would be to require the SSP to maintain back-end subscriptions to the PBX(es), and to compose all the relevant data into a single record. This isn't a difficult problem, but it requires significant new code in the SSP. The only way we could guarantee this working would be to mandate such behavior. I don't think that'll make people particularly happy. I'll add a slide to the deck for discussion at the face-to-face meeting to see what people want to do here. /a
- [martini] Announcement of MARTINI WG last Call on… Bernard Aboba
- Re: [martini] Announcement of MARTINI WG last Cal… Adam Roach
- Re: [martini] Announcement of MARTINI WG last Cal… Richard Shockey
- Re: [martini] Announcement of MARTINI WG last Cal… Jack Burton
- Re: [martini] Announcement of MARTINI WG last Cal… Bernard Aboba
- Re: [martini] Announcement of MARTINI WG last Cal… Elwell, John
- Re: [martini] Announcement of MARTINI WG last Cal… Hadriel Kaplan
- Re: [martini] Announcement of MARTINI WG last Cal… Elwell, John
- [martini] WGLC comments on draft-ietf-martini-gin Cullen Jennings
- Re: [martini] WGLC comments on draft-ietf-martini… Brian Lindsay
- Re: [martini] WGLC comments on draft-ietf-martini… Paul Kyzivat
- Re: [martini] WGLC comments on draft-ietf-martini… Brian Lindsay
- Re: [martini] WGLC comments on draft-ietf-martini… Cullen Jennings
- Re: [martini] Announcement of MARTINI WG last Cal… Adam Roach
- Re: [martini] WGLC comments on draft-ietf-martini… Brian Lindsay
- Re: [martini] Announcement of MARTINI WG last Cal… Adam Roach
- Re: [martini] WGLC comments on draft-ietf-martini… Paul Kyzivat
- Re: [martini] Announcement of MARTINI WG last Cal… Adam Roach
- Re: [martini] Announcement of MARTINI WG last Cal… Elwell, John
- Re: [martini] Announcement of MARTINI WG last Cal… Hadriel Kaplan
- Re: [martini] Announcement of MARTINI WG last Cal… David Hancock
- Re: [martini] Announcement of MARTINI WG last Cal… Elwell, John
- Re: [martini] Announcement of MARTINI WG last Cal… Doug Sauder
- Re: [martini] Announcement of MARTINI WG last Cal… David Hancock
- Re: [martini] Announcement of MARTINI WG last Cal… Horvath, Ernst
- Re: [martini] Announcement of MARTINI WG last Cal… Adam Roach
- Re: [martini] Announcement of MARTINI WG last Cal… David Hancock
- Re: [martini] Announcement of MARTINI WG last Cal… Adam Roach
- Re: [martini] Announcement of MARTINI WG last Cal… Adam Roach