[asterisk-users] Channel is answered by FXO card before callee answered the phone(pick up phone)
John Novack SCII
jnovack at stromberg-carlson.org
Fri Jun 6 07:28:07 CDT 2014
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!
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