My company sends out a lot of voicemails and I a want to enhance these voicemails with music and sound effects.  I have a full edit suite and can  create exciting and clear voicemails.. but how can I get them into the VM system without holding the phone up to a speaker.  I want to somehow use the 2.5mm jack to record them directly into the VM sytem.
I even dismembered a working headset and re-routed some of the wires but.. alas.. it failed...
Any thoughts would be greatly appreciated. 
THANKS!

Lands Phones - Vodavi - 30-Button XTS Telephone