unusual telephony request - recording voice mail

Tue Jan 27 22:57:41 UTC 2004

On Mon, 26 Jan 2004, James Knott wrote:

> The ringing current wouldn't normally get to the headset and it's only
> 90V 20Hz.
>
> I have seen other devices that connect via the headset jack.

Yes but only on phones that have internal power and/or a separation
transformer. The ring voltage appears on one wire from the telco. If any
one phone-plug is wired incorrectly then the ring voltage appears on the
phone handset jack vs. ground. You can buy a transformer for $2 so why
risk your equipment ?

Peter
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