Asterisk and telular gsm plant troubles

Hello all

I put a Telular gsm plant to a fxo port, I try calling to a cellular central number for test that works, but at the time that call answer for the plant, immediately is hangup.

For test the working in the Telular plant, I connect a normal phone, the call is answer and working fine, but at the time that the plant answer the call I hear a “click”, I think that this is the reason for that the call is hangup in Asterisk.

Someone knows how prevent that Asterisk detect the “click” like hangup signal.

Thanks

Sorry bad English.

This is concerning a FXO signaling. in analog cards