[SR-Users] Send UPDATE to inform changes in SDP

[Alfonso Pinto]

Hi guys,

I'm trying to setup a Call Forward No Reply with Kamailio and I've run into
this problem (that was expected):

When A INVITEs B, B replies with 183 and some SDP.
B doesn't answer so Kamailio triggers the timeout and sends the INVITE TO C.
C replies with 200 OK and some SDP, but A side drops the call as the media
session doesn't match with the expected one.

To solve it, I'm trying to send to A an UPDATE before relaying the 200 OK
from C. I tried to use UAC module (uac_req_send + $uac_req) but I don't see
how I can UPDATE the existing dialog. uac_req_send seems to try to setup a
new dialog always.
Is there a way to indicate to uac_req_send that I wan't to use the existing
dialog? Or maybe there is another mechanism I can use to send the UPDATE
inside the dialog?

Regards,
Alfonso.
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