[Asterisk-biz] IP Displays for public telephony booths

[C. Maj]

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