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

[Daniel-Constantin Mierla]

Hello,

On 9 Nov 2012, at 16:12, Alex Solt <alex_solt at hotmail.com> wrote:

> Hi,
> 
> To be accurate the next hop after kamailio is a session border controller and not an end-point. And the SBC is the one which get confused with the ACT received from kamailio. 
> Is sys_branch=0 shoudl be used within WITHINDLG block?

No, syn_branch is a global parameter, add it somewhere at the top of your config file.

Cheers,
Daniel

> 
> 
> Thanks,
> AS
> 
> Date: Fri, 9 Nov 2012 14:56:22 +0100
> From: miconda at gmail.com
> To: sr-users at lists.sip-router.org
> CC: alex_solt at hotmail.com
> Subject: Re: [SR-Users] "branch" tag in the "Via" header of the ACK message for the re-INVITE
> 
> 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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