If you will need to pass inspection or certification, I'd go with a
precertified module. They certify the line connection so you don't have
to. For a hobbiest type application, I'd check out
http://www.epanorama.net . He's got tons of stuff there, surely
something will work for you.

Josh

--
A common mistake that people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
fools.
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Steve Kasm wrote:
>
> Hello All,
>
> Does anyone know of the simplest way to detect the following 2 condition
> on a telephone line?
>
> 1.      When it is ringing
> 2.      When it is busy/off hook.
>
> My output from the above circuit needs to be logic 1 when the conditions
> are true and logic 0 when they are false.
>
> The circuit must also conform to the proper specs for interfacing to the
> phone line with regards to line isolation.
>
> Regards,
>
> Steve

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