[SIPForum-discussion] [spam] RE: A and B with G.711
Underwood, Rosa
rosa.m.underwood at verizon.com
Fri May 15 13:20:26 UTC 2009
Greetings:
Taken from RFC 4028 section 7
A re-INVITE generated to refresh the session is a normal re-INVITE,
and an UPDATE generated to refresh a session is a normal UPDATE. If
a UAC knows that its peer supports the UPDATE method, it is
RECOMMENDED that UPDATE be used instead of a re-INVITE. A UA can
make this determination if it has seen an Allow header field from its
peer with the value 'UPDATE', or through a mid-dialog OPTIONS
request. It is RECOMMENDED that the UPDATE request not contain an
offer [4], but a re-INVITE SHOULD contain one, even if the details of
the session have not changed. In that case, the offer MUST indicate
that it has not changed. In the case of SDP, this is accomplished by
including the same value for the origin field as did previous SDP
messages to its peer. The same is true for an answer exchanged as a
result of a session refresh request; if it has not changed, that MUST
be indicated.
________________________________
From: Vivek Batra [mailto:Vivek.Batra at matrixtelesol.com]
Sent: Thursday, May 14, 2009 11:59 PM
To: Underwood, Rosa; 'Jyothi Laxmish'; discussion at sipforum.org
Subject: [spam] RE: [SIPForum-discussion] A and B with G.711
In confirm dialog, you can negotiate SDP using Re-INVITE however you can
again negotiate the SDP in early dialog using UPDATE.
________________________________
From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Underwood, Rosa
Sent: Friday, May 15, 2009 3:12 AM
To: Jyothi Laxmish; discussion at sipforum.org
Subject: Re: [SIPForum-discussion] A and B with G.711
Greetings:
I believe a reINVITE should be used since the change will be during an
established dialog. RFC 3261 should provide guidance.
________________________________
From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Jyothi Laxmish
Sent: Thursday, May 14, 2009 6:15 AM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] A and B with G.711
Hi all
Suppose A and B are in conversation stage with g.711 codec.
A want to change his codec with g.729 ( any other also) which B
supports. In this
Scenario how A has to communicate with B in Sip. Whether UPDATE can
be used? If yes how?
Regards,
Jyothi
========================================================================
====================================================
Disclaimer:
This message and the information contained herein is proprietary and
confidential and subject to the Tech Mahindra policy statement, you may
review the policy at http://www.techmahindra.com/Disclaimer.html
externally and http://tim.techmahindra.com/Disclaimer.html internally
within Tech Mahindra.
========================================================================
====================================================
Email Scanned for Virus & Dangerous Content by :
www.CleanMailGateway.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sipforum.org/pipermail/discussion/attachments/20090515/c276872b/attachment-0002.html>
More information about the discussion
mailing list