Dear colleagues, the diagram shows below are originated because a problem with a integration between two PBX, Nortel and Broadsoft through sip trunk, the Nortel PBX forward the uri with the next format: From: <sip:1607;phone-context=SIP_cdp.SIP_udp@sip.nextel.nextel.cl;user=phone> But the Broadsoft can´t recongnize the "phone-context=SIP_cdp.SIP_udp", because this we put in the middle a Asterisk PBX, like a bypass, but with the same results, the Asterisk can recognize the "phonecontext=SIP_cdp.SIP_udp" and the call can´t perform. Nortel says we cannot modify the uri, and Broadsoft says the platform can´t reconize this uri, for all this is the solution with gateways, Colleagues think that can be done the solution shows below? Dear colleagues, is possible perform this comunication to fix this problem: Phone(1607)------Nortel<------sip----->gwA<-----------h323----------->gwB<------sip------>Broadsoft------Phone(26861168) voice     service voip voice service voip allow-connections h323 to sip allow-connections sip to h323 h323 sip ! voice     class codec 1 codec preference 1 g711alaw codec preference 2 g711ulaw codec preference 3 g729r8 codec preference 4 g729br8 dial-peer voice 1 voip description     entrada de llamados desde NORTEL voice-class codec 1 session protocol sipv2 session target sip-server session transport udp incoming called-number 2T ! dial-peer     voice 2 voip description hacia GW h323 service session destination-pattern 2T voice-class codec 1 session target ipv4:2.2.2.2(IP Gateway B) ! sip-ua sip-server ipv4:1.1.1.1(IP server Nortel) voice     service voip   allow-connections sip to h323   allow-connections h323 to sip h323 sip ! voice     class codec 1 codec preference 1 g711alaw codec preference 2 g711ulaw codec preference 3 g729r8 codec preference 4 g729br8 dial-peer     voice 1 voip description llamadas desde GW h323 service session incoming called-number 26xxxxxx voice-class codec 1 ! dial-peer     voice 2 voip description llamadas hacia BroadsoftPBX voice-class codec 1 session protocol sipv2 session target sip-server session transport udp destination-pattern 26xxxxxx ! sip-ua sip-server ipv4:3.3.3.3(IP server     Broadsoft) ... View more