[OpenSIPS-Users] B2B Module: Handling negative INVITE responses when using provisional_media

[Tolga Tarhan]

Hello,

We're using the B2B module to handle REFERs (as our upstream carriers do
not handle REFER). Everything works really well when we follow the examples
and when everything is successful. However, if the destination of the REFER
(not the provisional_media location, but the actual final destination)
responds negatively (say 603 or 404), then we see the following log messages

DBG:b2b_logic:b2b_logic_notify_reply: Received a reply [603] while in
BRIDGING scenario
ERROR:b2b_logic:process_bridge_negreply: unexpected entity_no [2] for tuple
[0x7f02af7d5278]
ERROR:b2b_logic:b2b_logic_notify_reply: Failed to process negative reply
while in bridging state

And the other existing call leg appears to get stuck. That is, it'll
continue to hear the provisional media until that runs out, and then it'll
just be hanging there. I would expect that the other call leg be sent a
BYE, which is exactly what happens in this scenario when provisional_media
is not used.

As far as I can tell, this is a bug in the b2b logic module. I'm happy to
try to make a patch and contribute a fix, however, I need a little guidance
on what needs to be done (I'm not at all familiar with the internals of
this codebase).

Thanks for your help,
Tolga
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