Wainwright, John wrote:
So can I use UPDATE to modify all the SDP dialog including the "c=" field on a call that has not been ACK'ed.
In particular I am thinking about UA-->softswitch-->Media Server sequence which plays an announcement/collect a new DN from the UA forwards this info to the softswitch ( in an application specific way ) who then sends out an INVITE to the collected DN and UPDATES the initial UA with this dialog information in order to connect the call. The initial UA would be in an early media type state in effect waiting for the UPDATE from the softswitch.
You need to also use reliable provisional responses to ensure that the early dialog is established. Then you can use the UPDATE to change it before the INVITE completes, potentially switching c= to a new place. I believe that should all be *legal*. However that doesn't guarantee that all the endpoints you are concerned with will support it.
Paul
Make sense ? John
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brett Tate Sent: Friday, May 20, 2005 12:22 PM To: 'Paul Kyzivat' Cc: [email protected] Subject: RE: [Sip-implementors] UPDATE or INVITE Replaces.
UPDATE can basically be used to
"update" everything a re-INVITE can "update".
This includes SDP changes which comply with RFC3264.
Not "everything". The UPDATE can't change the Contact address for the sip dialog.
According to Jonathan's posting, UPDATE can be used to "update" the Contact. Additionally the Contact is mandatory within UPDATE.
http://www1.ietf.org/mail-archive/web/sip/current/msg09391.html
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