[SR-Users] "branch" tag in the "Via" header of the ACK message for the re-INVITE

[Daniel-Constantin Mierla]

Hello,

try with global parameter:

syn_branch=0

An end-to-end ACK is a separate transaction, as it can go directly from 
caller to callee or skip some hops from the INVITE path (if no record 
routing is used). So branch in Via should not be used to match the 
dialog, but call-id, from-tag and to-tag. It would be also good ask the 
vendor to support properly sip rfc, other sip UAs may not have this 
configuration option.

Cheers,
Daniel

On 11/9/12 2:49 PM, Alex Solt wrote:
>
> Hi,
>
>
> We have a problem with the "branch" tag in the "Via" header of the ACK 
> message for the re-INVITE.  The "branch" tag value is not a unique 
> number so the end point thinks the ACK is belong to the previous call. 
> This causes the active calls fail after 15 min (right after the ACK 
> message for re-INVITE passed by kamailio proxy).
>
>
> Is there a way to set the "branch" tag in the "Via" header of the ACK 
> message for the re-INVITE to be a unique number?
>
>
> PS1: We are running kamailio v3.3.
>
> PS2: we did not have this issue with the old version of openser.
>
>
> Thanks,
>
> AS
>
>
>
>
>
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-- 
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio Advanced Training, Berlin, Nov 5-8, 2012 - http://asipto.com/u/kat
Kamailio Advanced Training, Miami, USA, Nov 12-14, 2012 - http://asipto.com/u/katu

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