[VoIP] Questions about payphones (was Re: CAMA and UK billing)

[Donald Froula]

John, here's the one doc I had.

Don

--- john jones <jjones3601 at yahoo.com> wrote:

> Don,
> 
> i would like a copy when you dig it up.
> 
> Thanks!
> 
> John
> 
> ----- Original Message ----
> From: Donald Froula <dfroula at sbcglobal.net>
> To: Voice Over IP Tandem for Analog Switches
> <voip at lists.ckts.info>
> Sent: Sunday, August 19, 2007 5:45:43 PM
> Subject: Re: [VoIP] Questions about payphones (was
> Re: CAMA and UK billing)
> 
> Mark, the coin station call control flow charts on
> the
> end of the document I sent should be a good
> beginning
> on coding the control signals. It looks like there
> are
> enough details on the use of polarity reversal and
> various Tip/Ring to ground conditions to serve as a
> design guide for the hardware.
> 
> I'll try to dig up the ACTS specs Monday. That may
> take a week or two.
> 
> Anyone who wants the document I sent Mark, drop me a
> private email. It runs 350K or so, titled:
> 
> Bellcore
> Public Telecommunications Service
> FSD 10-01-0000
> A Module of LSSGR, FR-NWT-000064
> 
> GENERIC REQUIREMENTS
> GR-528-CORE
> ISSUE 1, DECEMBER 1994
> 
> Don
> 
> --- Mark Rudholm <mark at rudholm.com> wrote:
> 
> > Jayson Smith wrote:
> > 
> > >      So what you're saying is, a standard
> > four-wire phone cord would do the
> > > trick as far as all phone service and coin relay
> > control is concerned? So
> > > could I have him just run a four-wire modular
> jack
> > or plug, connecting all
> > > relevant wires, and have all my bases covered?
> > 
> > Yes.  When in real service, these phones are
> > connected to Tip and
> > Ring from the CO, and a local earth ground.  This
> > way, they are able
> > to operate on a single wire pair, just like any
> > other phone.
> > 
> > They're quite easy to wire up yourself.  Just buy
> a
> > modular cord
> > that has spade lug terminals on one end.  The
> > terminals are clearly
> > marked "T", "R", and "G", which correspond to
> Green,
> > Red, and
> > Yellow, respectively.  But I suppose Phil can do
> > that for you if
> > you're buying a phone from him.
> > 
> > >      That's what I thought about initial
> deposit.
> > So, have him set that to
> > > five cents, so it never becomes an issue.
> > 
> > Yep.  Again, this isn't hard to do yourself.
> > 
> > >      How are you thinking of pulling this off in
> > software? Will there be a
> > > configuration file with rates and time limits
> > specified? Or will an
> > > extension need to call an application and
> specify
> > what rate to charge for
> > > how long, and if no application call is ever
> made,
> > the call is free?
> > 
> > I don't intend for this to be a commercially
> useful
> > project.  To
> > be commercially useful, you'd want to take an
> > entirely different
> > approach --like out-of-band coin deposit and
> control
> > signaling
> > within the IAX2 or SIP protocol itself, not
> in-band
> > tones.  One
> > wouldn't want to repeat the mistakes of Ma Bell :)
> > 
> > I haven't addressed the software configuration
> issue
> > yet.  DTMF
> > and MF decoding is done in dsp.c via some simple
> > goertzel analyses.
> > What I had in mind was to add a fifth row and
> column
> > to the DTMF
> > tone set for 1700 and 2200Hz.  This would
> basically
> > give me another
> > "digit" to use in the dialplan.  Coin
> return/collect
> > would be
> > handled with a shell or PERL script called via
> AGI. 
> > I was planning
> > on relying on the functions of features.conf to
> give
> > me the
> > ability to detect "buttons" in-call ("buttons" in
> > this case
> > would be the 1700+2200Hz coin tones).  Beyond
> that,
> > I haven't
> > solved it...
> > 
> > Ultimately, I would be able to publish a
> schematic,
> > some assembly
> > instructions, a patch set for Asterisk, as well as
> > some
> > instructions and examples of how to write the conf
> > files.
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> > 
> 
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