[asterisk-users] Channel is answered by FXO card before callee answered the phone(pick up phone)

[John Novack SCII]

A J Stiles wrote:
> On Thursday 05 Jun 2014, Mojtaba wrote:
>> My scenario is (2)
> After doing some tests with my own hardware, I'm now convinced that this is
> actually normal behaviour:  As far as Asterisk is concerned, a call is deemed
> "answered" as soon as the hardware seizes the line.  It is only "not answered"
> if the line is not available.
>
> Which makes sense, because an analogue line has no D-channel.  Once the trunk
> is acquired successfully, there is no way for a machine to know the state of
> the call beyond then.  Such supervisory information as there is -- a regular
> cadence during ringing, possibly a burst of white noise and then a human voice
> -- is geared towards interpretation by human beings.
>
> Moerover, since the tones are different in every country  (and sometimes,
> between different telephone exchanges in the same country; at one time, the UK
> was using three sets of supervisory tones depending whether you were on an
> old-fashioned "clicky-clicky" exchange, an intermediate-generation analogue
> electronic exchange or System X)  it would not be a trivial task to make sense
> of them.
>
>
> I think if you want full supervisory information, you are going to need to use
> some sort of digital telephony technology  (ISDN or GSM).
>
This is well known behavior for many years, since the inception of Asterisk/Zaptel
I wonder why tests had to be run!
The OP issue was answered several days ago
His issue was obvious and well stated until another poster confused the issue!

John Novack