Hi here is my setup : 1. USER -> PSTN -> Asterisk A -> IAX2 Trunk -> Asterisk B -> SER -> Asterisk C (Accepting DTMF) All Asterisk box has dtmfmode = inband, when user pressed DTMF able to receive and working fine. 2. Asterisk C ---> Dial Customer Customer input DTMF and its not taking any dtmf but If I change dtmfmode to auto Asterisk C will take DTMF from users but my first Scenario fails if I change dtmfmode = auto in Asterisk C. Need urgent help. Thanks Arun