Hi All, According to the abstract "IP PBX / Service Provider Interoperability" ( http://www.sipforum.org/component/option,com_docman/task,doc_download/gid,134/Itemid,75/) there is a set of recommendations that must be followed: "This document outlines an interface specification that enables direct IP peering between a SIP-enabled Service Provider network and a SIP-enabled Enterprise Network for the purpose of originating and/or terminating calls from the Public Switched Telephone Network (PSTN). It specifies the minimal set of IETF and ITU-T standards that must be supported,provides precise guidance in the areas where the standards leave multiple implementation options, and specifies a minimalset of capabilities that should be supported by the Service Provider and Enterprise networks." I wonder if the PJSIP agrees with those recommendations, or whether it is possible to make SIP trunk, using an implementation based on PJSIP. Thanks in advance Cesar
