[Asterisk-Users] No detection of Line Busy

[Steven Critchfield]

On Mon, 2003-10-20 at 08:42, Herc wrote:
> ----- Original Message ----- 
> From: "WipeOut" <wipe_out at onetel.com>
> To: <asterisk-users at lists.digium.com>
> Sent: Monday, October 20, 2003 9:26 PM
> Subject: Re: [Asterisk-Users] No detection of Line Busy
> 
> 
> > herc at wavelink.com.my wrote:
> >
> > >Hello,
> > >
> > >I am quite new to asterisk.
> > >I managed to connect our 2 branch offices with asterisk.
> > >
> > >In one side, our linux asterisk box is connected to the leased line going
> > >to our other office and on the other side its connected to office PBX
> through a
> > >channel bank.
> > >
> > >This installation is running smoothly, except for one thing.
> > >If an extension is busy, i want to transfer that call to a near by
> > >one, so i did like this,
> > > Dial(Zap/g1/55|15|t)
> > > Dial(Zap/g1/59|15|t)
> > >the prob is, when ext. 55 is busy, the caller hear busy tone and thats
> all,
> > >asterisk doesn't execute the second line.
> > >even when the ext. 55 is busy, still the asterisk log says,that zap line
> > >as answered.
> > >I need to get this thing settled quickly, cos, this is a already found
> > >feature in our office hardware PBX.
> > >Can anyone pls help me????
> > >
> > >Herc
> > >
> > >
> > >
> > >
> >
> > Try something like..
> >
> > exten => 55,1,Dial(Zap/x|15|t)
> > exten => 55,102,Dial(Zap/y|15|t)
> >
> > Where Zap/x is the channel that connects extension 55 and Zap/y is the
> > channel that connects to extension 59..
> >
> > Later..
> >
> 
> I am not directlyl connecting to extensions 55 and 59. I have few office PBX
> extensions coming
> to the channel bank(which is connected to linux box), and i have grouped
> those channels under 'g1'.
> so i am dialing ext 55 and 59 from extensions in group 'g1'.

Your problem basically comes from the fact that in the analog world, a
busy signal is a audio only signaling. Asterisk could do this detection
if it was directly touching the phones, or if it was connected digitally
to the switch that touches the phones. 

I think there are some busydetect features you can turn on in the
zapata.conf file, but they are one of the things that is prone to
diconnecting a call early as you are trying to fuzzy match a pattern of
sound at the beginning of the call. 
-- 
Steven Critchfield  <critch at basesys.com>