13 Dec
2013
13 Dec
'13
11:52 p.m.
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(a)gmail.com>om>:
--
Daniel-Constantin Mierla - http://www.asipto.com
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
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(a)gmail.com
fbattimo(a)meetecho.com
skype: flaviobattimo
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