Here is a link that I found:

http://www.cisco.com/univercd/cc/td/doc/product/tel_pswt/vco_prod/sup_call/sup04.htm

Hope it helps.

Dan

On Fri, 8 Jun 2001 12:06:41 -0400, Dan Michaels wrote:

>At 03:12 PM 6/8/01 +0100, you wrote:
>>I want to make a simple phone switch board.
>>Are there any devices available that supply e.g. busy, and engaged tones or
>>info somewhere on the web.
>>TIA
>>
>
>I have some links to TP circuitry/etc here:
>
>http://www.oricomtech.com/teklink2.htm#Tele2
>
>The cisco.com link is a good overview.
>
>best regards,
>- dan michaels
>===========================
>
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