Converting phone handset audio to PC soundcard line-in audio

From: Isaac Grover (ephesys_at_myexcel.com)
Date: 07/16/04 

Date: 16 Jul 2004 12:28:39 -0700

Hi everyone,

I have been recording weekly conference calls since January, and I'm
looking to upgrade the quality of my recordings. Currently, I'm
connecting my cordless phone to the line-in jack on my PC's soundcard
with a 6' audio cable.

I would like to take the audio from a landline telephone, so I tore
apart the handset on my wired phone to see which wires connected the
handset's speaker to the base. I saw that it was pins 2 and 3 (top
left and bottom right), so I connected pin 2 (green) on the handset
jack to ground on a spliced audio cable, and connected pin 3 (red) on
the handset jack to tip on the audio cable.

I can hear the audio from the phone line, but not without problems.
There is an intrusive hum that almost drowns the phone line audio, and
whenever pin 2 (green) is connected to ground on the audio cable, my
wired phone's base takes the line off-hook, even if the handset is
still on the cradle.

So can someone tell me how to eradicate the hum, and how to keep the
line on-hook if I am not using my "high-tech" conversion device?

Thanks,
Isaac

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