[asterisk-users] Is this possible?

[C F]

Dont Use Call Progress Instead Use The M Option In App Dial That Asks
The User To Press A Button To Accept The Call

On 11/21/06, shadowym <shadowym at hotmail.com> wrote:
>
> Anyone tried this,
>
> I put in an Asterisk/FreePBX phone system to replace one of those el cheapo
> Bizfon analog key systems.  The Bizfon was able to do follow me to analog
> lines but I do not believe the capability is in Asterisk.  Of course now it
> becomes the one feature they cannot do without.  Somehow the Bizfon is able
> to detect if an analog line is answered (without answer supervision).  If
> not it goes to the Bizfon voicemail.  I have not figured out a way to do
> this in Asterisk/FreePBX.
>
> Anyone know how Bizfon does it? Is there a way to do it in Asterisk?  The
> analog lines are standard loop start lines in a hunt group provided by Bell
> Canada.  They do not have any type of answer supervision such as polarity
> reversal.  I think maybe the Bizfon asks for button press confirmation on
> the other end and if not it times out.  That's just a theory though.  With
> Asterisk, as soon as an analog line goes off hook and starts ringing
> Asterisk set's that line to "answer" state unless it has polarity reversal
> (answer supervision for loop start lines).  Once Asterisk thinks the Analog
> line is answered you cannot do anything further.
>
> callprogress=yes provides the functionality I believe but this is a
> production environment and that feature does not work reliably enough.  Is
> this how bizfon does it maybe?  Maybe they can detect the ringing indicating
> the call was not answered?
>
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