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

[Doug Alderdice]

Ooops, shoulda read the thread a bit closer before replying...  Yeah, I am 
using the cheap card in my *, so it returns answer for almost any 
situation.  But, the cheap cards are $10, channel banks (and the requisite 
$$$ T1 card) are way more than that.

D.


At 11:24 PM 11/5/2007 -0400, I wrote:
>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.
> > >
> > >
>
>
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