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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.<br>
<br>
If you wand us to try to help more, perhaps is better to provide
syslog messages with debug=3 in kamailio.cfg.<br>
<br>
Cheers,<br>
Daniel<br>
<br>
<div class="moz-cite-prefix">On 13/12/13 11:58, Flavio Battimo
wrote:<br>
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cite="mid:CADKbteeR16gwkhLmx-83JBQPBG=89T5NnDpnVEN8D0HfdhyWow@mail.gmail.com"
type="cite">
<pre wrap="">I attach a Wireshark dump
2013/12/13 Flavio Battimo <a class="moz-txt-link-rfc2396E" href="mailto:flaviobattimo@gmail.com"><flaviobattimo@gmail.com></a>:
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<pre wrap="">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
<a class="moz-txt-link-abbreviated" href="mailto:flavio.battimo@gmail.com">flavio.battimo@gmail.com</a>
<a class="moz-txt-link-abbreviated" href="mailto:fbattimo@meetecho.com">fbattimo@meetecho.com</a>
skype: flaviobattimo
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<pre wrap="">_______________________________________________
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<br>
<pre class="moz-signature" cols="72">--
Daniel-Constantin Mierla - <a class="moz-txt-link-freetext" href="http://www.asipto.com">http://www.asipto.com</a>
<a class="moz-txt-link-freetext" href="http://twitter.com/#!/miconda">http://twitter.com/#!/miconda</a> - <a class="moz-txt-link-freetext" href="http://www.linkedin.com/in/miconda">http://www.linkedin.com/in/miconda</a></pre>
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