Hi Barry, Thanks for trying to help me out. Unfortunately your suggestion didn't work out. Not sure why. I tried a few other functions like t_relay_to. Guess I still have a lot to learn about this kamailio stuff in more complex setups. Any other ideas, anyone? Ttyl, Dave -----Original Message----- From: Barry Flanagan &lt;barry(a)flanagan.ie&gt; Date: Thu, 21 Mar 2013 12:01:18 To: &lt;sr-users(a)lists.sip-router.org&gt; Subject: Re: [SR-Users] 2 kamailio servers sharing one database and one dns name On 20 March 2013 03:05, David Thomson &lt;jdavidthomson(a)hotmail.com <mailto:jdavidthomson@hotmail.com> > wrote: hi, I have two kamailio 3.3.4 servers sharing one database.  usrloc module is loaded on both machines.  The DNS name for the machines is shared (i.e siptest.testdomain.com <http://siptest.testdomain.com> with 2 public ip's - one for Server1 and one for Server2) and setup in round robin mode. The scenario is as follows: User 1 registers to Server1 User 2 registers to Server2 User1 tries to call User2 but Server1 throws an error and the call doesn't ever connect to User2:  WARNING: usrloc [udomain.c:321]: non-local socket <udp:xxx.xxx.xxx.xxx:5060>...ignoring.   Hi I think you can use the t_replicate function within your register route so that each server will replicate the registration request to the other.  I did this many years ago on OpenSER using the following just before the consume_credentials() line.  On each of the servers you want to check that the src_ip is not that of the OTHER sever so they don't keep sending back and forth forever :-) So in the example below 10.0.1.1 is the IP of the other server. --------8<-----------------------------------------        if (!src_ip==10.0.1.1) {                t_replicate("udp:10.0.1.1:5060 <http://10.0.1.1:5060> ");                xlog("L_INFO", "Replicating $ct, URI = $ru");        };        consume_credentials(); --------8<----------------------------------------- Have a look at http://www.kamailio.org/docs/modules/3.3.x/modules/tm.html#t_replicate Hope this helps. -Barry