[Serusers] Bug # 2925

[Jiri Kuthan]

I received questions for more detailed explanation, so here it is:
branch value serves as transaction id, which (among others) differentiates
retransmission of the same request from new requests. From
RFC3261's standpoint, ACK for a 200 (as opposed to a [3-6]xx ACK)
is a separate transaction, i.e., a different branch value is
adequate.

In case people do keep asking: it is really so, and receivers
MUST be able to deal with ACK branch different from branch
in INVITE. Let's think of a proxy that does not record-route
and introduced branch 1234 to "its" Via. ACK coming later
directly to UAS includes UAC's branch which is different from
proxy's branch. It may or may not be the same as UAC's INVITE 
branch but it is different from what UAS sees.

-jiri

At 12:44 AM 4/20/2005, Darryl H. Thomas wrote:
>-----Original Message-----
>From: Jiri Kuthan [mailto:jiri at iptel.org] 
>Sent: Tuesday, April 19, 2005 2:23 PM
>To: Darryl H. Thomas; serusers at lists.iptel.org
>Subject: Re: [Serusers] Bug # 2925
>
>The bug report is invalid, ignore it. branch=0 in ACK to a 200
>is perfectly valid according to RFC3261. Your termination provider
>must be using a buggy devices.
>
>-jiri
>
>At 07:04 PM 4/19/2005, Darryl H. Thomas wrote:
>>Hello everyone,
>>
>>I was wondering whether anyone knew what was going on with the
>following
>>bug:
>>http://developer.berlios.de/bugs/?func=detailbug&bug_id=2925&group_id=4
>80
>>
>>For those not wanting to follow the links, this is a bug submitted by
>>someone back in December wherein ser puts 'branch=0' in the Via header
>it
>>creates for an ACK to a 200 OK Invite response.
>>
>>I haven't seen any activity related to this, and it's affecting
>>interoperability with one of our termination providers.
>>
>>0.9.0 users, have you seen the same problem??
>>
>>Cheers,
>>Darryl
>>
>>_______________________________________________
>>Serusers mailing list
>>serusers at lists.iptel.org
>>http://lists.iptel.org/mailman/listinfo/serusers
>
>--
>Jiri Kuthan            http://iptel.org/~jiri/ 

--
Jiri Kuthan            http://iptel.org/~jiri/