Dear Sirs, I have an Asterisk box with two X100P one connected to the PSTN and the other one with a conventional PBX. When the asterisk pass a call from the PSTN to the PBX (making a zap channel bridge) the Zap channel is never realised. Neither when the PSTN hangups nor when the PBX hangups. What is going wrong? Here I attach part of my extension.conf file exten => s,1,Answer exten => s,2,Background(bienvenida-es) exten => s,3,Dial(SIP/Phone4&SIP/Phone3&Zap/g1/5&Zap/g1/4,20,tr) exten => s,4,Voicemail,u3 exten => s,5,Hangup exten => s,105,Voicemail,b3 exten => s,106,Hangup Thank you in advance, Juanjo