I have an asterisk box running Asterisk 1.2.8 and I installed a digium TDM2400 with 8 FXO ports. When I amke a call to the PSTN, the zap channel answers, and teh call goes through if a PSTN is connected to the answered port. However, if there is no dial tone in the answered channel, or if no POTS line is connected, the user gets no indication until the call time outs. I want * to be able to detect if there is a dialtone on the channel, before it dials, if not, to send a busy signal or choose another available channel.
Thanks.
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