[OpenSIPS-Users] 503 translated to 500 between opensips and homer

[Bogdan-Andrei Iancu]

Hi Richard,

See rfc3261, chapter 6 "Choosing the best response", Page 111 :

  	 A proxy which receives a 503 (Service Unavailable) response
          SHOULD NOT forward it upstream unless it can determine that any
          subsequent requests it might proxy will also generate a 503.
          In other words, forwarding a 503 means that the proxy knows it
          cannot service any requests, not just the one for the Request-
          URI in the request which generated the 503.  If the only
          response that was received is a 503, the proxy SHOULD generate
          a 500 response and forward that upstream.


Still, this gives you access (at script level) to the 503 reply (the 
change is done when sending it out), so you can investigate the Reason 
hdr (if present).

And yes, we got your other email.

Regards,

Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com

On 06.01.2017 17:14, Richard Robson wrote:
> hmm,
>
> both our suppliers translate an unavailable number (Q.850;cause=41) as 
> a 503.
>
> I Guess Im going to have to live with that.
>
> Did you see the other email this morning regarding opensips crashing?
> I unhelpfully called the  email opensipsp
>
>
>
> On 06/01/2017 14:41, Bogdan-Andrei Iancu wrote:
>> Hi Richard,
>>
>> Any incoming 503 reply is converted by OpenSIPS to a 500 reply (as 
>> per RFC3261).
>>
>> Regards,
>> Bogdan-Andrei Iancu
>> OpenSIPS Founder and Developer
>> http://www.opensips-solutions.com
>> On 06.01.2017 16:22, Richard Robson wrote:
>>>
>>> Hi,
>>>
>>>
>>> we are getting 503 messages back but when this is stored on Homer as 
>>> a 500. I'm not sure if its Opensips's sipcapture module or Homer 
>>> doing the translation
>>>
>>>
>>> This is the packet captured in sngrep in the sip box
>>>
>>> 2017/01/06 14:13:59.210301 141.170.24.20:5060 -> 192.168.36.141:5060
>>> SIP/2.0 503 Service Unavailable
>>> Via: SIP/2.0/UDP 141.170.9.156:5060;branch=z9hG4bKd116.a30f9976.0
>>> From: <sip:442035420637 at 192.168.36.68>;tag=as55dfe54a
>>> To: <sip:+447910705624 at 141.170.24.20>;tag=gK00d54f0d
>>> Call-ID: 
>>> DLGCH_e0lXV2Z/MWR7SFYIMHFjZ3oSAwoyL2YwfkdXX2F5YGsPQVxcfXhma2FDU0BlcWpmf0ZV
>>> CSeq: 103 INVITE
>>> X-ISUPMtype:0c
>>> Reason: Q.850;cause=41;x-source=a
>>> Content-Length: 0
>>>
>>> this is the same packet viewed in Homer
>>>
>>> 2017-01-06 14:13:59 +0000 : 141.170.24.20:5060 -> 192.168.36.141:5060
>>> SIP/2.0 *500* Service Unavailable Via: SIP/2.0/UDP 
>>> 141.170.9.156:5060;branch=*z9hG4bKd116.a30f9976.0* From: 
>>> <sip:442035420637 at 192.168.36.68>;tag=*as55dfe54a* To: 
>>> <sip:+447910705624 at 141.170.24.20>;tag=gK00d54f0d Call-ID: 
>>> *492956a7483fc8345bfdaf6c17212008 at 192.168.36.68:5060* CSeq: 103 
>>> INVITE X-ISUPMtype:0c Reason: Q.850;cause=41;x-source=a 
>>> Content-Length: 0
>>>
>>> the sip code and the callid have been changed. the call id is the 
>>> same as the original call from the outbound asterisk box
>>>
>>>
>>> Regards,
>>> -- 
>>> Richard Robson
>>> Greenlight Support
>>> 01382 843843
>>> support at greenlightcrm.com
>>>
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at lists.opensips.org
>>> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>>
>
>
> -- 
> Richard Robson
> Greenlight Support
> 01382 843843
> support at greenlightcrm.com

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