[asterisk-users] Dial Command Option D Early Bridged

[Jared Smith]

On Tue, 2008-06-24 at 05:54 -0400, Al Baker wrote:
> How do other applications, such a the automated dialers from telemarketers,
> reliably detect when the call has been "answered" ?
> I thought this sort of basic functionality that had been around for 
> quite awhile.

For digital connections (such as a PRI on a T1 or E1), the telco sends a
signal when the far end has answered the call.  For analog lines (at
least here in the United States), however, there is typically no
signaling from the telco to let you know when the far end has answered
the call.  The best you can do is to try to listen to the audio and use
audio characteristics to try to determine if it was answered.


-- 
Jared Smith
Training Manager
Digium, Inc.