Hello, cross-posting has to be avoided, because you mix things from different projects which don't apply to the others -- just send separate emails, with content appropriate for each forum, referring to the things you tried with that project. You posted pretty much the same question and I answered that you have to use path module if you want to have an outbound proxy to be used for registration by the phones behind the nat or that outbound proxy has to be used for calls going to those user agents. The I suggested to just relay it to the registrar, with t_relay_to(...) from tm module. Have you tried? What was not working? Post config parts used by you along with the ngrep trace of such scenario and we might spot what is wrong and give further guidelines. From your previous email, you deal with porta sip which was using openser at some point, so they should be able to handle path extension. Cheers, Daniel On 3/21/12 6:01 PM, Robert wrote: -- Daniel-Constantin Mierla Kamailio Advanced Training, April 23-26, 2012, Berlin, Germany http://www.asipto.com/index.php/kamailio-advanced-training/