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

Alex Solt alex_solt at hotmail.com
Fri Nov 9 16:12:38 CET 2012


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?


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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    -- 
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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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