[SR-Users] Last negative 5XX reply not getting relayed

[Alex Balashov]

Hi,

1. Do you have a failure_route for this transaction? If so, can you provide it?

2. Make sure the `failure_reply_mode` modparam for TM is set to 3, which
is default anyway:

https://kamailio.org/docs/modules/5.1.x/modules/tm.html#tm.p.failure_reply_mode

-- Alex

On Mon, May 14, 2018 at 11:33:15AM -0400, Sergiu Pojoga wrote:

> Not sure if it's a default Kamailio behavior or something I'm doing wrong...
> 
> When receiving a negative reply for an INVITE (more like in the 5xx range),
> proxy doesn't relay the message to the originator but instead issues it's
> own "500 Service Unavailable".
> 
> That doesn't happen, from observations so far, to "603 Declined" or "486
> Busy Here" or "404 Not Found" or "200 OK" replies.
> 
> *For example, here's the negative reply proxy receives from the callee:*
> 
> 2018/05/14 10:52:37.716627 65.XX.XX.166:5060 -> 65.XX.XX.167:5060
> SIP/2.0 503 Service Unavailable
> Via: SIP/2.0/UDP
> 65.xx.xx.167;branch=z9hG4bK9223.00b4f3143d245a895c4bb6a107add258.0;received=65.xx.xx.167;rport=5060
> Via: SIP/2.0/UDP
> 205.xx.xx.221;received=205.xx.xx.221;rport=5060;branch=z9hG4bKQ4XpXga0vgZ8B
> From: "514XXXXXXX" <sip: 514XXXXXXX @205.xx.xx.221>;tag=tXj0NHrje9jNS
> To: <sip:450XXXXXXX at 65.xx.xx.167>;tag=as18e452b7
> Call-ID: 48eac296-d229-1236-a685-005056a149a4
> CSeq: 122818714 INVITE
> Server: Asterisk
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO,
> PUBLISH, MESSAGE
> Supported: replaces, timer
> Session-Expires: 1800;refresher=uas
> X-Asterisk-HangupCause: Subscriber absent
> X-Asterisk-HangupCauseCode: 20
> Content-Length: 0
> 
> *Here's what the originator gets in the final message:*
> 
> 2018/05/14 10:52:37.718143 65.xx.xx.167:5060 -> 205.xx.xx.221:5060
> SIP/2.0 500 Service Unavailable
> Via: SIP/2.0/UDP
> 205.xx.xx.221;rport=5060;branch=z9hG4bKQ4XpXga0vgZ8B;received=205.xx.xx.221
> From: "514XXXXXXX" <sip:514XXXXXXX at 205.xx.xx.221>;tag=tXj0NHrje9jNS
> To: <sip:450XXXXXXX at 65.xx.xx.167>;tag=31a2c69b5d434ef4a60796e26f568bf0-9343
> Call-ID: 48eac296-d229-1236-a685-005056a149a4
> CSeq: 122818714 INVITE
> Server: Kamailio 5.1
> Content-Length: 0
> 
> I'd like any reply to be relayed back as is, unless I do some
> t_check_status() => t_reply() for specific reasons (which I have none at
> this point).
> 
> Thanks
> Sergiu

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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/