On Thu, Dec 05, 2019 at 10:38:10PM -0600, Yanko wrote: ... ... You need to change the domain of the R-URI ($rd) to the other IP address. You don't need any extra modules. You need to add some logic, essentially you need to implement areacodes/prefixes. I'm not going to show you how, it is really simple and a good piece of homework to do. ;) But you need logic like this: create a numberingplan you'd want to use. eg: 0161 == 172.16.16.1 0162 == 172.16.16.2 If the number ($rU) someone dials doesn't start with 0, it is a local number. If it starts with 0, you have an areacode to match to figure out where to send the call: if($rU starts with 0) { if(areacode is 161) { $rd="172.16.16.1"; } ... } if(uri!=myself) { route(RELAY); exit; } else { do local stuff. }