Hello everyone:
I have a problem where Asterisk need to make a sip outbound call and detect the
Ring back tone or? audio announcement before "answer".? Asterisk need
to avoid calling expensive rate premium numbers which have no pattern to
differentiate them from normal? numbers. When Such numbers are dialed, an audio
announcement warn the customer about its expensive rate. At this time, Asterisk
needs to detect this audio and hangup. Another way, is to detect the time when
the channel receive ring back tone, if it it took certain period of time to
start ringing, then it is a premium number and Asterisk need to hangup.
I searched a lot on this topic and I found out that all Asterisk dial plan
starts when the channel is answered. I am not aware of any module in the dial
plan that provide any information about the sip call status before
"answer".
Thanks in advance
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