[VoIP] Line reversals for payphones.....

[Doug Alderdice]

That's a function of Asterisk, as I understand it.  After issuing the dial 
command, the * returns answer to the called party.

Doug.

At 10:03 PM 11/5/2007 -0500, Jayson wrote:
>Ah, so that's why Doug's SXS lines supervise right after dialing! Idealy,
>his busy, RNA, reorder, etc. shouldn't supe, but they do.
>Jayson
>
>----- Original Message -----
>From: "Shane Young" <voiptandem at shaneyoung.com>
>To: <voip at ckts.info>
>Sent: Monday, November 05, 2007 5:27 PM
>Subject: Re: [VoIP] Line reversals for payphones.....
>
>
> > Supervision is transmitted correctly over CNET correctly all the time,
> > as long as it's sent correctly.
> >
> > In your example, you would dial the number, the ATA collects digits
> > and determins when you are done dialing.
> >
> > It send a message to asterisk.
> >
> > If the call terminates to IVR or something internal in that Asterisk
> > system you will be given answer supvervision unless it's specifically
> > told not to.
> >
> > If the call get's sent out another channel (IP or TDM) you'll get
> > answer supervision when that channel provides it.
> >
> > Here is what confuses most people when they first start using
> > asterisk.  Cheap FXO cards in an asterisk pc will supervise almost
> > immediately after dialing.  Even though the far end hasn't answered,
> > this particular step will provide "early" answer supervison.
> >
> > Instead of using those cheap FXO cards, you need to use something that
> > is has the ablity to see polarity reversal and communicate that as
> > answer.  For calls coming in on selector levels, use DPT cards in a
> > channel bank.  These will give you the correct supervision.
> >
> > So to your point: "even if my FXS device were capable of delivering a
> > reversal, answer supervision would not necessarily be detected at the
> > terminating end nor transmitted across CNET." which is true of any
> > network.
> >
> > Let me re-prhase it:  If the far end doesn't supply answer supervision
> > correctly, I will not expect to receive it correctly.
> >
> >
> >
> >
> >
> >
> > Quoting Steph Kerman <stfkerman at jps.net>:
> >
> >> I've asked the same basic question a number of times because many of us
> >> own payphones, have coin control equipment and would like correct
> >> "charging" to occur.  The replies I received seemed to say that even if
> >> my FXS device were capable of delivering a reversal, answer supervision
> >> would not necessarily be detected at the terminating end nor transmitted
> >> across CNET.  I don't know whether this is accurate or why it would be
> >> so but this is what I've been told.
> >
> >