On 04/23/2010 05:18 AM, Raphael Coeffic wrote:
On 23.04.10 09:51, Alex Balashov wrote:
On 04/22/2010 10:01 AM, Stefan Sayer wrote:
]
clean? I am not so sure any more, trying to hack something together to
see where this gets. Is there a clean and simple method to do re-invite
from the b2bua, which catches all the possibilities (changed session
etc)?
e.g., one possibility, reinvite with last SDP from the other side
From my understanding of SSTs, this is the correct approach (last
known SDP). This has the advantage of not breaking the changes of real
re-INVITEs that actually happened.
Sending an empty INVITE has the appeal of working with either side (no
matter with which you begin). With the other, you might have to remember
which side initiated the last INVITE or UPDATE transaction, and send the
last positive SDP answer to this side as a re-INVITE. Or am I missing
something?
However, it might happen that the one of the ends does not support
receiving empty INVITEs... (less probable today).
I thought about empty INVITEs first, but my--admittedly naive--reading
of the specs suggests that many endpoints would take the absence of an
SDP offer/answer in a sequential request or reply within the same
session to mean that the media elements of the session have been
rescinded.
If I'm wrong, that would certainly make all this a lot easier.
--
Alex Balashov - Principal
Evariste Systems LLC
1170 Peachtree Street
12th Floor, Suite 1200
Atlanta, GA 30309
Tel: +1-678-954-0670
Fax: +1-404-961-1892
Web: http://www.evaristesys.com/
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