[OpenSER-Users] totag in 200 cancelling reply

[Alex Hermann]

Hello,

Situation is :

UAC -> Asterisk1 -> OpenSER -> Asterisk2

OpenSER is using tm module (t_relay and friends).

When the UAC cancels an INVITE, the CANCEL is propagated to Asterisk2 which 
replies to the INVITE with a 487 and to the CANCEL with 200 OK. Both replies 
have the same ToTag, as rfc3261 9.2 suggests (SHOULD). The 487 reply is 
forwarded to Asterisk1 by OpenSER with the ToTag unaltered, but the 200 OK is 
forwarded as "200 cancelling" with a different ToTag (created by OpenSER). 
This messes up the transaction matching on Asterisk1 (which uses pedantic=yes 
in the sip.conf and has to stay that way)

Is there a way to force OpenSER to use the ToTag of the incoming reply (the 
winning branch?) instead of it creating a new one?

-- 
Greetings,

Alex Hermann