Re: [SIP] 3PCC and the re-invite response
"Brett Tate" <brett@broadsoft.com> Fri, 01 December 2000 23:50 UTC
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From: Brett Tate <brett@broadsoft.com>
To: Igor Slepchin <ISlepchin@dynamicsoft.com>, Sip Mail List <sip@lists.bell-labs.com>
References: <B65B4F8437968F488A01A940B21982BF3CE98B@DYN-EXCH-001.dynamicsoft.com>
Subject: Re: [SIP] 3PCC and the re-invite response
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Date: Fri, 01 Dec 2000 18:28:48 -0500
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> > What I'm saying is that I don't see this as a problem with 3pcc at all. > Given Figure 1 in > http://search.ietf.org/internet-drafts/draft-rosenberg-sip-3pcc-01.txt, why > would A change the media in 200OK to the second INVITE? Instead of inventing > workarounds for eccentric UAs, it would be much easier to define what a > "sane" UA can and cannot do (e.g., it cannot change SDP just because it > received a re-INVITE, there should be another valid reason for the change). > The main reason during call setup is because codecs and other stuff may not have been fully negotiated. Another reason is because many current UA's respond to hold SDP with hold SDP. Thus both sides would be passing hold SDP with 0.0.0.0 as connection addresses, and the call would not get established. After a call has been established, the SDP-change-loop can occur if one of the sides chooses not to use the SDP information that it used prior to the hold. Many current implementation tend to use a different port when coming off hold, thus the race condition tends to occur often. _______________________________________________ SIP mailing list SIP@lists.bell-labs.com http://lists.bell-labs.com/mailman/listinfo/sip
- Re: [SIP] Re: No SDP => take off hold? [WAS: 3PCC… Henning Schulzrinne
- Re: [SIP] 3PCC and the re-invite response Brett Tate
- RE: [SIP] 3PCC and the re-invite response Jonathan Rosenberg
- Re: [SIP] Re: No SDP => take off hold? [WAS: 3PCC… Henning Schulzrinne
- RE: [SIP] 3PCC and the re-invite response Henry Sinnreich
- Re: [SIP] 3PCC and the re-invite response Brett Tate
- Re: [SIP] 3PCC and the re-invite response Brett Tate
- Re: [SIP] 3PCC and the re-invite response Gethin Liddell
- Re: [SIP] 3PCC and the re-invite response Gonzalo Camarillo
- [SIP] 3PCC and the re-invite response Gethin Liddell
- Re: [SIP] 3PCC and the re-invite response Gonzalo Camarillo
- Re: [SIP] 3PCC and the re-invite response Anders Kristensen
- Re: [SIP] 3PCC and the re-invite response Brett Tate
- RE: [SIP] 3PCC and the re-invite response Jonathan Rosenberg
- Re: [SIP] 3PCC and the re-invite response Brett Tate
- RE: [SIP] 3PCC and the re-invite response Igor Slepchin
- RE: [SIP] 3PCC and the re-invite response Gethin Liddell
- Re: [SIP] 3PCC and the re-invite response Gonzalo Camarillo
- Re: [SIP] 3PCC and the re-invite response Brett Tate
- RE: [SIP] 3PCC and the re-invite response Igor Slepchin
- RE: [SIP] 3PCC and the re-invite response Igor Slepchin
- Re: [SIP] Re: No SDP => take off hold? [WAS: 3PCC… Gethin Liddell
- Re: [SIP] 3PCC and the re-invite response Vladislav Zubarev
- RE: [SIP] 3PCC and the re-invite response Jonathan Rosenberg
- Re: [SIP] 3PCC and the re-invite response Vladislav Zubarev
- Re: [SIP] 3PCC and the re-invite response Gethin Liddell
- Re: [SIP] Re: No SDP => take off hold? [WAS: 3PCC… Anders Kristensen
- Re: [SIP] Re: No SDP => take off hold? [WAS: 3PCC… Brett Tate
- [SIP] Re: No SDP => take off hold? [WAS: 3PCC and… Anders Kristensen
- Re: [SIP] 3PCC and the re-invite response Gethin Liddell
- Re: [SIP] Re: No SDP => take off hold? [WAS: 3PCC… Anders Kristensen
- Re: [SIP] Re: No SDP => take off hold? [WAS: 3PCC… Brett Tate
- RE: [SIP] 3PCC and the re-invite response Culpepper, Bert
- Re: [SIP] 3PCC and the re-invite response Gethin Liddell
- Re: [SIP] 3PCC and the re-invite response Brett Tate