[asterisk-dev] SIP CANCEL/To tag

[Klaus Darilion]

alex at pilosoft.com wrote:
> On Sat, 1 Apr 2006, Johansson Olle E wrote:
> 
>>> It means that we should send exactly what we sent in the INVITE, not
>>> the ones added later in the session by the UAS.
>> On the other hand, I meant to write but got sidetracked, the
>> implementations may wary since the RFC is not very clear - I guess.
>>
>> Are you having problems?
> Yes. TNT wants the CANCEL to have the tag. However, after discussion on
> various mailing lists, it appears that most agree that Asterisk is doing 
> the right thing on this one.


Considering a parallel forking scenario:

asterisk--> proxy ---> gw1
                   ---> gw2

the CANCEL may nto have a To: tag as the totag received from gw1 is 
different thant the one received from gw2. Thus it would match only on 
gateway.

regards
klaus