I have two Asterisk boxes, Box1 has TDM22B and Box2 has a TDM11B. From Box1 I can pick up Zap/1 and dial 300 causing Zap/1 on Box2 to ring. From Box2 I can pick up Zap/1 and dial 100 causing Zap/1 on Box1 to ring. PSTN calls come into Box1. They ring thru to Box2 on Zap/1 via IAX, then if no answer they ring Zap/1 on Box1. When such a call comes in and is answered on Box1, I can transfer to Box2 by dialing #300. But when such a call is answered on Box2, attempts to transfer to Box1 by dialing #100 fail. If I can dial 100 from Box2, then why can't I transfer using the very same Dial command? exten => 100,1,Dial(IAX2/name:pass@66.43.226.110/100) When I watch the attempt on the CLI of Box1, it tells me that there is no such extension 1 in context ' '. I think I have a conceptual problem.. can anyone help? DB