[OpenSIPS-Users] Second call on transferred with B2B refer scenario

[Santi Antón]

Hello,

I'm trying to implement attendant transfer capability to our Opensips server with the b2b module and refer.xml scenario.
Attended transfer works fine except the transferred receives a new call rather than update the ongoing call with transferor.
Looking for the cause I saw that from tag is different between the initial call (INVITE) to transferred and the from tag in Replaces header (INVITE). I think the two from tag have to be the same to consider the second INVITE an update and not a new call.
Attached you can find a capture with an isolated example (9443 calls 9441 and does an attended transfer to 9442).
Maybe I'm not understanding the module behavior but I couldn't find any clue in module's documentation.

Thanks in advance,
 
Santi Antón