Hello,

rls shouldn't do any dns query internally (I haven't really checked the code, but I don't see a reason for it) -- all dns things (including srv) are done at relaying time by core and tm module.

On the other hand, kamailio needs to know what are the local domains (which domains are to be served by kamailio). This is done by doing reverse dns query on all IPs kamailio is listening on, and afaik, that cannot follow to dns srv.

It the case that Kamailio has to server a domain that doesn't point via DNS A record to kamailio, then set that domain as value to 'alias' global parameter. The alternative is using domain module with register_myself.

Kamailio is used a lot in multi-domain scenarios, in most of the cases by using domain module.

If it is not working with alias, then send here the relevant log messages to be able to spot what the problem is.

Cheers,
Daniel


On 22/08/14 11:21, Mihai Marin wrote:
Hello Daniel,
Thank you for your answer. I managed to fix 20 minutes ago but the issue (I think) is in the RLS module. I had to add outbound_proxy and change the server_address parameters for the RLS to the real domain that ponts to kamailio.

Previous (when this was not working) I had
modparam("rls", "server_address", "sip:rls@domain.com")
The fix was:
modparam("rls", "server_address", "sip:rls@sip.domain.com")
modparam("rls", "outbound_proxy", "sip:sip.domain.com")

I'm like a beginner with this beautiful technology but I can't understand why this is happening. The RLS module checks for A record instead of SRV record in the DNS? 

As I mentioned in my previous e-mail, my DNS configuration for domain.com is:
A records:
@  - > a web server ip
sip - > kamailio's ip
SRV records:
_sip._udp.domain.com -> sip.domain.com:5060

In my theory (what I understood) is that kamailio checks for the SRV record. So, to identify the IP, will follow the steps:
1. check SRV record (_sip._proto.domain.com) for domain.com ......sip.domain.com:5060
2. check A record for sip.domain.com.......xx.xx.xx.xx
3. send to xx.xx.xx.xx:5060
In a multidomain scenario, all the domains should have the SRV record in DNS pointing to sip.domain.com:5060.

I can't see how this RLS could work with a multi-domain scenario. Is it correct? Do I misunderstand something in the theory?

I hope I don't tell stupid things here.

Thank you.

Best regards,
Mihai M


On Fri, Aug 22, 2014 at 10:38 AM, Daniel-Constantin Mierla <miconda@gmail.com> wrote:
Hello,

if you want to handle the domain.com on the SIP server but the IP of that domain is pointing elsewhere, just add in kamailio.cfg:

alias=domain.com

An alternative is to use domain module (suitable when you have many domains and you want to store them in database).

Cheers,
Daniel


On 21/08/14 19:06, Mihai Marin wrote:
Hello Sirs,
The RLS module is eating my life. I just managed to make it work 2 months ago and now is not working anymore after I tried to put the kamailio under domain (until now it was simple ip).
I don't understand why is not working but I saw a big difference that I don't understand:
My environment:
- the domain "domain.com" is pointing to the web server
- kamailio is hosted under sip.domain.com
- DNS has domain.com A record for web server's ip, sip.domain.com A record for kamailio's ip and SRV record for _sip._tcp.domain.com poting to sip.domain.dom
Problem:
kamailio presence is not working anymore and I think, the error is:
grep_sock_info - checking if host==us: 11==14 && [domain.com] == [xx.xx.xx.xx witch is the sip.domain.com IP]

If, I change domain.com in DNS to point on the same ip as sip.domain.com RLS is working. This, I can't understand. Can anyone explain me why is not working using this configuration? Also, the RLS is working if i change my domain to be sip.domain.com (ex: sip:user@sip.domain.com).


Thank you.


Best regards,
Mihai M


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-- 
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Next Kamailio Advanced Trainings 2014 - http://www.asipto.com
Sep 22-25, Berlin, Germany ::: Oct 15-17, San Francisco, USA


-- 
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Next Kamailio Advanced Trainings 2014 - http://www.asipto.com
Sep 22-25, Berlin, Germany ::: Oct 15-17, San Francisco, USA