[Asterisk-Users] Detecting answer supervison from an AGI app

[John Todd]

>I've got a dumb Western Electric payphone and some homebuilt 
>hardware to control the coin relay which is accessible to Asterisk 
>through the AGI interface. I'd like to be able to set the state of 
>the coin relay to collect at the end of a call if a called party 
>answers.
>
>[Hey, I admit this project is being persued just for the fun of it ]
>
>Looking through the documentation, there is a way to get channel 
>state, but it only tells you that the channel is
>bridged and does not tell you the called party has answered.
>
>Is there another interface (unix sockets maybe?) which I can
>use to query the answer supervison state for a given channel?
>
>Steve.

You can use the manager interface.  See the Wiki or various "how-to" 
guides scattered across the four corners of Google.  You'll only be 
able to detect answer supervision with PRI or VoIP calls outbound - 
FXO circuits have no answer supervision.

I'm interested in your payphone application; I was given a payphone 
for the holidays, and I'd like to semi-gut it and put an ATA type 
device in there and an 802.11 adapter.  Feed it 110VAC and point a 
yagi at it from a few miles away.  For that matter, ten or fifteen of 
them.  This is one of those spare-time projects that I've been 
intentionally ignoring, because I'll quickly become distracted with 
trying to build a company that does wireless payphones via IP.  I 
have the business plan mostly written in my head already.  <sigh>

I assume mine generates coin tones; it would be pretty snappy if * 
could detect those tones and do something with them when detected 
in-band in the audio stream.  I don't know how the payphones would 
normally squelch these tones from being replayed into the phones; 
that would be an interesting thing to dig around inside the phone to 
find out about (in my free time!) because I know that playback of 
tones became impossible in the mid 80's due to squelching locally on 
the phones.  I like the novelty of a VoIP phone that collects coins - 
I'm suspicious of this whole "pre-paid" thing.  ;-)

Yet Another Application That Needs Audio Processing After Dial (YAATNAPAD)...

JT