I've had good success testing Cermetek CH1808 to
remotely power on a receiving device when the phone
rang. Runs about US$20-US$25 in single quantities and
FCC approved, it may also be approved by other
government('s) organizations.

Hooked it to a 12C509 and was able to detect Ring and
local hook status.

Good luck!

--- Adi Linden <adil@ADIS.ON.CA> wrote:
> Hi,
>
> I am looking for information on circuitry to
> interface with telephone
> lines. Any ideas of where to start looking?
>
> Here is the concept of my idea:
>
>   I have a bunch of network gear which sometimes
> locks up for no apparent
>   reason. I need a low cost device to reset the
> equipment via telephone. I
>   know there are managed powerbars but my goal is
> for something a lot less
>   expensive.
>
>   So the little box sits on the phoneline and
> detects an off-hook
>   condition. Once the line is off-hook, it listens
> for a dtmf tone
>   sequence. If the proper sequenze is received, it
> will then turn a relay
>   off, delay and on to reset the connected
> equipment.
>
>   An additional thought would be for the device to
> actual answer an
>   incoming call after x number of rings, sound a
> beep and wait for a dtmf
>   sequence.
>
> I think some telephone interfacing circuitry and a
> PIC should be able
> to easily accomplish the task.
>
> Adi
>
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