Jon wrote:
Hi all,
Im new to this group so hope I arent asking an already asked question,
or got in the wrong group...

I have a Sony 7900R Mini-Disc unit and want to connect the mute lead
to my Nokia Phone Car kit.

The car kit has a single mute lead (+12V during no call, 0V during a
call).

Can I simply connect this yellow Nokia mute lead to the lead on the
Sony -

Yes.

The manual says it has a "Telephone ATT Lead"? Any ideas which
pin it is?

Dunno. They're often labelled on the stereo loom though.

Once mute lead is connected what does it do? Im hoping it will stop
the MD playing as I already have a mute lead that sits in the speaker
wiring loom to mute the stereo during a call.

You're probably wasting your time connecting in then. I haven't seen a
MD one but every CD one only mutes the sound the CD keeps playing.

John