16 Sep
2013
16 Sep
'13
3:27 p.m.
On Mon, Sep 16, 2013 at 7:34 AM, Daniel-Constantin Mierla <miconda(a)gmail.com
wrote:
Hello,
On 9/12/13 10:08 PM, Brian Wallen wrote:
Suppose I have three or more kamailio servers. If a call comes in and
lookup() returns that no record was found, how do I know which server to
forward to? Is that a case in which I should replicate the database?
I currently have two independent kamailio
servers. I'd like to set them
up in a way that user1 on server1 can make a call to user2 on server2.
After searching I've come up with two ways that this might be able to be
done. Can someone please sanity check these or point me in the right
direction?
1. Have one registrar server and convert the other server to a proxy
2. Keep them both as registrars and somehow make them each aware of the
users on the other server
I like 2 better because if one server went down users on the other server
would still be up. The only thing is I don't know how to set the servers up
to communicate with each other.
the nat can create problems when a server is down - if the nat is
symmetric, only the server that received the registrar can send back calls
to the phone.
Communication between users on two servers is as simple as using
t_relay_to("proto:serverip:**port") after you do lookup("location")
and
no record is found. You have to add an extra check for the case the call
was coming from the
other server, not to forward back to it in case of no found again.
Thanks for the tip, I hadn't thought of that.
Also, you should skip user authentication for calls
from the other server
(not do authenticate twice). Another aspect to take care is chaining
rtpproxy, you have to use the flat for trusting the other server (r, iirc).
You can also replicate the registration, but again, it can add troubles to
the nat. Look at t_replicate() (in tm module).
Cheers,
Daniel
--
Daniel-Constantin Mierla - http://www.asipto.com
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