Am 09.10.2013 17:56, schrieb Keith: From Kamailio point of view you do not have a trunk yet. You are having an Asterisk server registering on you Kamailio. If sombeody calls this registered user, the call gets forwarded to Asterisk and the RURI will be identical to the contact registered by Asterisk "s@.....". So to make a trunk, you need some logic in your Kamailio which: 1. check the called number 2. matches the called to a user 3. lookup the registration of this user 4. somehow signal the called number to this user This 4th step can be done by adding a dedicated header and inspect the header on Asterisk, or use the usual (non standard conform way) to signal the original called number in the user part of the request URI, eg: # save the called number $var(did)=$rU; # look up the did and get the respective user, e.g. use sqlops and SELECT ...... ..... # asume the associated user of the DID is in $var(user) $rU=$var(user); lookup("location"); # overwrite the user part with the DID $rU=$var(did); t_relay(); klaus