Music Extension

Hello,
I am somewhat new to Trixbox/Asterisk (1.2 years to be exact) and I know that Trixbox/Asterisk isn't intended for what I am asking, but here goes.

I have Trixbox currently set up in an office environment and a couple of my users enjoy the music on hold so much that they are wondering if I can set up my music on hold to continuously play through the phone's speaker. I am currently using a collection of Cisco 7960G's and 7970G's.

Currently in order to please them I have set up a dummy extension that does not get registered to any device, and I have a ring all group with the "dummy extension" placed in it, after 1 second of ringing it immediately goes to the terminate call group and puts callers on hold forever.

I know this question may sound ridiculous, but anything to keep my employees happy I guess. Just wondering if anyone has another suggestion, or if this feature is available through a package update.

Thanks
-Jeff