Hello,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.
On 9/12/13 10:08 PM, Brian Wallen wrote:
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.
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.
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
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