Title: Message
Comments inline…
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Attila Sipos
Sent: Wednesday,
January 28, 2004 12:46 PM
To: Ranjit Avasarala (WT01 -
TELECOM & INTER-NETWORKING SOLUTIONS); [EMAIL PROTECTED]; [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: RE: [Sip-implementors]
Some Questions on use of UPDATE method
I agree that I don't
think you can send an UPDATE to answer an INVITE.
However, UPDATE can be
used to change session/media BEFORE
an INVITE/200
OK. Otherwise you could just use re-INVITE's.
[ABN] in this case functionality of both re-Invite and UPDATE are
similar but the actual difference lies where UPDATE is always one way whereas
in re-invite the negotiation happens like initial invite request. In UPDATE,
either offer is accepted or ignored but the entity which receives UPDATE can’t
send it’s allowed media parameters in the response, like what happens in 200OK
for INVITE or re-INVITE.
From Abstract of RFC 3311
(UPDATE RFC) -
....UPDATE
allows a client to update
parameters of a session (such as the set of media streams and
their
codecs) but has no impact on the state of a dialog. In that
sense,
it is like a re-INVITE, but unlike re-INVITE, it can be sent
before
the initial INVITE has been completed. This makes it very
useful for
updating session parameters within early dialogs.
-----Original
Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
Sent: 28 January 2004 04:43
To: [EMAIL PROTECTED];
[EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: RE: [Sip-implementors]
Some Questions on use of UPDATE method
I don't think u can send
UPDATE to answer a INVITE. UPDATE is used to change session / media parameters
after INVITE/200 OK.
Ranjit
Ph: 8520408/16 extn: 2173
-----Original
Message-----
From:
[EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Kasammiya Patil
Sent: Tuesday, January 27, 2004
8:36 PM
To:
[EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: [Sip-implementors] Some
Questions on use of UPDATE method
Hi,
I have couple of questions regarding the use of
UPDATE method.
1. Can UPDATE be used to send an answer SDP ?
Consider the following scenario:
- INVITE was sent without SDP
- 18x is received with Offer SDP
- There is no PRACK exchange because 18x does not contain a Require:100rel
header
Now can UPDATE be used to send answer SDP??
2. As per RFC 3311, UPDATE method should be used only
if dialog is established.
If INVITE/18x exchange happened without PRACK, can both ends treat this as
early dialog and feel free to use UPDATE ?
3. Is 18x send/recv over TCP considered reliable ?
In the following scenario:
- INVITE with offer sdp sent
- 18x over TCP with answer sdp recvd (No PRACK exchange happened)
Now can the caller/calleee use UPDATE ?
Appreciate any responses.
Thanks,
Kasam
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