[SR-Users] reply code for lower cseq

[Daniel-Constantin Mierla]

Hello,

On 4/24/12 3:55 PM, Olle E. Johansson wrote:
> 24 apr 2012 kl. 14:27 skrev Daniel-Constantin Mierla:
>
>> Hello,
>>
>> thanks, I found that as well, but I didn't wanted to believe is no update to it in regard to sip client behavior. A phone replying with such generic code is really misleading for such case . So I searched further in 4xx class, base rfc and other extensions, and could not find anything.
>>
> You propably want to add a reason header or something to explain for the poor guy running wireshark.
> The error code is not all.
I would do if I was developing the hard/softphone. So I was actually 
wondering how to detect such situation based on the reply received in 
the proxy.

Btw, what Asterisk/Sems does in this situation (just for the developers 
of such end points here :-) ), any special hint-header added?

Cheers,
Daniel
>
> /O
>> Cheers,
>> Danie
>>
>> On 4/24/12 2:17 PM, Andrew Pogrebennyk wrote:
>>> Hi Daniel,
>>> See RFC 3261 section 12.2.2:
>>>
>>>     If the remote sequence number was not empty, but the sequence number
>>>     of the request is lower than the remote sequence number, the request
>>>     is out of order and MUST be rejected with a 500 (Server Internal
>>>     Error) response.
>>>
>>> However, 400 or some 4xx response would seem more reasonable to me, to
>>> let the UAC know it just did something wrong.
>>> And I'm not the only one:
>>> http://comments.gmane.org/gmane.ietf.sip-implementors/8970
>>>
>>> On 04/24/2012 02:10 PM, Daniel-Constantin Mierla wrote:
>>>> Hello,
>>>>
>>>> I was wondering if someone here can point quickly where specs mention
>>>> what is the right reply code to send when a request within dialog is
>>>> received with lower cseq value than the previous request. I couldn't
>>>> spot the part in the RFC yet, if any related exists.
>>>>
>>>> Cheers,
>>>> Daniel
>>>>
>> -- 
>> Daniel-Constantin Mierla - http://www.asipto.com
>> http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
>>
>>
>> _______________________________________________
>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
>> sr-users at lists.sip-router.org
>> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
> ---
> * Olle E Johansson - oej at edvina.net
> * Cell phone +46 70 593 68 51, Office +46 8 96 40 20, Sweden
>
>
>

-- 
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda