[Asterisk-biz] IP Displays for public telephony booths

[ht at phonitel.com]

Wow,

This is quite agressive in regards to english language and Iraq ! !

Anyway, call metering, also known as call counters are display devices used by
hotels, callshops and above all public booths to rate, in real time, the call
(you know cost of call as it goes).

The way it works is that , the carrier (POTS) sends usually 12 khz / 16 khz
pulses through the phone line, and this triggers increments in the call counter
to display price of call. Each pulse corresponds to a unit price.

This has nothing to do with sampling of voice but is beyond that frequency.

Now the question is, if we want asterisk to communicate real time cost of calls
to a display unit, how would we approach this?


-----Original Message-----
From: asterisk-biz-bounces at lists.digium.com
[mailto:asterisk-biz-bounces at lists.digium.com] On Behalf Of C. Maj
Sent: Thursday, February 03, 2005 5:03 PM
To: Commercial and Business-Oriented Asterisk Discussion
Subject: Re: [Asterisk-biz] IP Displays for public telephony booths


On Thu, 3 Feb 2005, Steve Kann waxed:

> ht at phonitel.com wrote:
>
> >Hello,
> >
> >We do have a call meter solution. The way it works is that it is
> >triggered by 12 khz, or 16 khz frequencies.
> >
> >So this only works if you have a frequency generator based on a rate
> >table.
> >
> >The question is interesting of how to make those work with Asterisk:
> >
> >1-) Can asterisk generate 12 khz signals on its interfaces?
> >
> >2-) Can it send such frequencies signal on the ;
> >
> >3-) Any other concept ?
> >
> I don't have any idea what this post is about, but asterisk, like any

Then don't reply like a pompous ass because you mastered the English language
first.  Go back to Iraq.

> traditional telephony system, work with an 8khz sample rate, so it
> can't
> reproduce any audio frequencies greater than 4khz.

How do you think DSL works ?  Or maybe a POTS line isn't on
the map in your world of traditional telephony systems ?

Before this post, I never heard of such a call meter, either. But all it took
was one google hit for "call meter 12khz" to get this:

http://www.accesscomms.com.au/12khz.htm

So, to answer the question, Asterisk can probably be setup
to do this on an FXO/FXS interface, if you were to modify
the sample rate ZT_CHUNKSIZE in zaptel.h -- currently, everything is locked to
an 8khz rate by that variable.

--Chris


--
Chris Maj, Rochester
cmaj_at_freedomcorpse_dot_com
Pronunciation Guide: Maj == May _______________________________________________
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