[SR-Users] Kamailio s-cscf SRV <Root> query

[Daniel-Constantin Mierla]

Not using ims modules I don't know if they do any dns internally. But 
speaking in general for kamailio, when sending out with t_relay() or 
forward(), if the SRV fails, the fallback is to do A query on hostname 
from R-URI and use default SIP port 5060.

If you wand us to try to help more, perhaps is better to provide syslog 
messages with debug=3 in kamailio.cfg.

Cheers,
Daniel

On 13/12/13 11:58, Flavio Battimo wrote:
> I attach a Wireshark dump
>
>
> 2013/12/13 Flavio Battimo <flaviobattimo at gmail.com>:
>> Hello,
>>
>> working on Kamailio SCSCF module, when I receive an INVITE the serving
>> module should find the corresponding ICSCF to forward the INVITE. In
>> order to do this it should perform a NAPTR query, followed by a DNS
>> SRV query and a DNS A query.
>>
>> In our case the serving has the following behavior:
>> 1) it CORRECTLY make NAPTR query
>> 2) it send an SRV query to resolve ICSCF service port having invalid
>> response 4 times.
>>
>> After 4 times, so 20 seconds, it sends INVITE message to ICSCF at
>> default port 5060.
>> SRV query contains a null name, shown as <Root> in Wireshark. Current
>> DNS application (MyDNS) answer with a not implemented response.
>>
>> I expect that the serving CSCF try to resolve the ICSCF making an SRV
>> query and an A query to discover the service port and ip address using
>> the domain returned by NAPTR query.
>>
>> I have two questions:
>> It seems that SRV query is not valid, because it's not based on SIP
>> domain, do you think it's correct?
>>
>> At least, is it possible to configure s-cscf to force an INVITE to be
>> sent always to the same interrogating?
>>
>> --
>> Flavio Battimo
>> flavio.battimo at gmail.com
>> fbattimo at meetecho.com
>> skype: flaviobattimo
>
>
>
>
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-- 
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda

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