Can you upload somewhere a SIP trace, so we can understand the setup and SIP flow.
Also, is the VIA appearing only in ACK, or in INVITE too?

Best regards,
Razvan

On 1/31/19 2:21 PM, Johan De Clercq wrote:
2 different ones and I use 244

On Thu, 31 Jan 2019, 13:20 Răzvan Crainea, <raz...@opensips.org <mailto:raz...@opensips.org>> wrote:

    Hi, Johan!

    Are there two identical via headers, or only one?
    What is the OpenSIPS version you are using?

    Best regards,
    Răzvan

    On 1/30/19 9:27 PM, johan de clercq wrote:
     > Hi,
     >
     > I found it :
     >
     > 1. This code results in having only one VIA header:
     >      ##initial INVITE
     >      if (is_method("INVITE") && !has_totag())
     >      {
     >          xlog("callid=$ci: Route[0]: initial INVITE is coming in
    from A: $fU to B: $rU");
     >          xlog("callid=$ci: Route[0]: let's do accounting first");
     >          do_accounting("db","cdr");
     >          topology_hiding();
     >
     > 2. The code resulting in 2 VIA headers:
     >      ##initial INVITE
     >      if (is_method("INVITE") && !has_totag())
     >      {
     >          xlog("callid=$ci: Route[0]: initial INVITE is coming in
    from A: $fU to B: $rU");
     >          xlog("callid=$ci: Route[0]: let's do accounting first");
     >          topology_hiding();
     >          do_accounting("db","cdr");
     >
     > Is this now a bug or can somebody please explain why the code in
    2 results in 2 VIA headers ?
     >
     > -----Original Message-----
     > From: Users <users-boun...@lists.opensips.org
    <mailto:users-boun...@lists.opensips.org>> On Behalf Of vasilevalex
     > Sent: Wednesday, January 30, 2019 8:13 AM
     > To: users@lists.opensips.org <mailto:users@lists.opensips.org>
     > Subject: Re: [OpenSIPS-Users] topology_hiding : ACK has extra via
    header.
     >
     > Hi Johan,
     >
     > We are using topology_hiding in tm mode.
     > I've checked your case, ACK has only one VIA header.
     >
     > What about BYE from the phone (if phone ends call)? Does it has
    extra VIA?
     > Do you use dialog or tm mode for topology hiding?
     >
     >
     >
     > -----
     > ---
     > Alexey Vasilyev
     > --
     > Sent from:
    
http://opensips-open-sip-server.1449251.n2.nabble.com/OpenSIPS-Users-f1449235.html
     >
     > _______________________________________________
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     >
     > _______________________________________________
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-- Răzvan Crainea
    OpenSIPS Core Developer
    http://www.opensips-solutions.com
    Meet the OpenSIPS team at the next OpenSIPS Summit:
    https://www.opensips.org/events

    _______________________________________________
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    http://lists.opensips.org/cgi-bin/mailman/listinfo/users


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--
Răzvan Crainea
OpenSIPS Core Developer
  http://www.opensips-solutions.com
Meet the OpenSIPS team at the next OpenSIPS Summit:
  https://www.opensips.org/events

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