asterisk users - Mar 2006 - HOWTO volume per (7960) phone

I may be mistaken (the first time) but I thought someone once told me it
was possible to set the volume on a per phone basis. All users have
7960's running 7.4 or 7.5; server running 1.2.5; & one tdm04b.  Is this
indeed possible?, and, if so, would someone be so generous as to point
me at a URL.

Thanks very much.

Cheers.

Jason SJOBECK