[SR-Users] DNS resolution and logical domain

[Mickael Marrache]

Hi,

 

I sometimes get the following errors:

 

kamailio[16098]: ERROR: <core> [resolve.c:1693]: sip_hostport2su(): could
not resolve hostname: "mycompany.com"

kamailio[16098]: ERROR: tm [ut.h:319]: uri2dst2(): failed to resolve
"mycompany.com"

 

mycompany.com cannot be resolved using DNS (there is no corresponding DNS
entry). I use this as a logical domain and I don't expect Kamailio to
resolve it. Also, I set use_domain (usrloc module) to 0 so only the RURI
username is used when searching locations.

 

The flow is as follows:

 

-the proxy receives the INVITE with sip:
<sip:%3cuser%3e at myloadbalancerip:5060> <user>@myloadbalancerip:5060 which
then forwards the INVITE to a proxy

-the proxy looks for <user> internally and finds that this user has multiple
subscribers (endpoints)

-for each subscriber, a branch is appended using append_branch (or the RURI
is replaced for the first subscriber) - the new RURI for each branch is sip:
<sip:%3csubscriber%3e at mycompany.com> <subscriber>@mycompany.com

-finally, lookup_branches is called to look for locations for every
subscriber

 

lookup_branches only uses the subscriber (RURI username) for searching
locations since use_domain is set to 0.

 

However, I sometimes get the errors I mentioned.

 

Any idea why Kamailio sometimes tries to resolve the domain name?

 

Thanks,

Mickael

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