[SR-Users] switch kamailio to domain

[Daniel-Constantin Mierla]

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 at domain.com 
> <mailto:sip%3Arls at domain.com>")
> The fix was:
> modparam("rls", "server_address", "sip:rls at sip.domain.com 
> <mailto:sip%3Arls at sip.domain.com>")
> modparam("rls", "outbound_proxy", "sip:sip.domain.com 
> <http://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 <http://domain.com> is:
> A records:
> @  - > a web server ip
> sip - > kamailio's ip
> SRV records:
> _sip._udp.domain.com <http://udp.domain.com> -> sip.domain.com:5060 
> <http://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 <http://proto.domain.com>) 
> for domain.com <http://domain.com> ......sip.domain.com:5060 
> <http://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 <http://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 at gmail.com <mailto:miconda at gmail.com>> wrote:
>
>     Hello,
>
>     if you want to handle the domain.com <http://domain.com> on the
>     SIP server but the IP of that domain is pointing elsewhere, just
>     add in kamailio.cfg:
>
>     alias=domain.com <http://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 <http://domain.com>" is pointing to the
>>     web server
>>     - kamailio is hosted under sip.domain.com <http://sip.domain.com>
>>     - DNS has domain.com <http://domain.com> A record for web
>>     server's ip, sip.domain.com <http://sip.domain.com> A record for
>>     kamailio's ip and SRV record for _sip._tcp.domain.com
>>     <http://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
>>     <http://domain.com>] == [xx.xx.xx.xx witch is the sip.domain.com
>>     <http://sip.domain.com> IP]
>>
>>     If, I change domain.com <http://domain.com> in DNS to point on
>>     the same ip as sip.domain.com <http://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 <http://sip.domain.com>
>>     (ex: sip:user at sip.domain.com <mailto:sip%3Auser at sip.domain.com>).
>>
>>
>>     Thank you.
>>
>>
>>     Best regards,
>>     Mihai M
>>
>>
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>
>     -- 
>     Daniel-Constantin Mierla
>     http://twitter.com/#!/miconda  <http://twitter.com/#%21/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

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