Dear list: When I call an specific number on the PSTN, the provider who holds the destination number give back an specified sound just after admitting their incoming calls. Is there a way to allow Asterisk to compare sounds received to decide what is the Telco answering the call?
I'm planning to do it to select the right provider to route further calls at least cost. In my country there are no public or accessible information on ported out numbers, so it is a way to discriminate what are the destination's Telco and build a database. Thanks in advance! Elder D. Arohuanca Lima - Peru
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