Hello. I've set up a X100P and got it working. Now, I need to set it up so that it checks if the line is being used before attempting to make a call on it. I tried: exten => _NXXNXXXXXX,1,ChanIsAvail(Zap/1) exten => _NXXNXXXXXX,2,Dial(Zap/1/${EXTEN}) exten => _NXXNXXXXXX,102,Dial(IAX2/voipjet/${EXTEN:1}) but that only goes to 102 if another device on the * server is using the Zap channel. What if the Zap channel is actually being used by a phone connected to that same PSTN line, not through the * server. What I mean is, how can I tell * to check the line voltage before attempting to make a call? -- Nabeel Jafferali tel: 416.491.9136 (toronto) 646.225.7426 (new york) fwd: 46990 email/msn : nabeel<at>jafferali.net