[SR-Users] Failure Route Issue

[mack at dopensource.com]

Thanks Alex…

Maybe, I’m not understanding.  How do I get Kamailio to send the ACK to the media server versus sending it to the SIP service.  It seems that Kamailio is remembering the negative ACK, which was already sent back to the SIP service and it’s sending it again versus sending the ACK to the Media Server.



> On Apr 17, 2018, at 2:26 PM, Alex Balashov <abalashov at evaristesys.com> wrote:
> 
> Hi,
> 
> ACKs in response to negative replies are what are called hop-by-hop
> ACKs, and should be addressed to the next hop.
> 
> Also, it is not necessary to explicitly do an append_branch() in
> failure_route nowadays if manipulating the RURI. It'll be done for you.
> 
> -- Alex
> 
> On Tue, Apr 17, 2018 at 02:22:39PM -0400, mack at dopensource.com wrote:
> 
>> Hey All,
>> 
>> I have a weird issue.  I’m sending a SIP INVITE to a SIP Service that send’s me back a 433, which let’s me know that the number is invalid.  I then send an INVITE to a media server (FreeSwitch) to play a message that the number can’t be called, which looks to be working.  But, the final ACK from the SIP client is sent back to the SIP Service versus the media server.  The following diagram below depicts this: https://snag.gy/qMWfvk.jpg.  The code snippet in the failure_route for the the SIP Service has this:
>> 
>> if (t_check_status("403|433")) {
>>               if ($avp(s:teleblock_media_enabled) == "1") {
>>                       # make sure media server can route back to kamailio
>>                       record_route();
>>                       revert_uri();
>>                       $ru = "sip:" + $T_reply_code + $rU + "@" + $sel(cfg_get.teleblock.media_ip) + ":" + $sel(cfg_get.teleblock.media_port);
>>                       append_branch();
>>                       t_relay();
>>                       exit;
>> 
>>               }
>> 
>> 
>> 
>> 
>> _______________________________________________
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>> sr-users at lists.kamailio.org
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> 
> -- 
> Alex Balashov | Principal | Evariste Systems LLC
> 
> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free) 
> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
> 
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