Which IP phone are you talking about? The keymaps are different depending on which phone it is, and the Openstage phones have a permanent mute button already. Otherwise, like he said, just program a key as MUTE - you can do it graphically in Assistant, or if you use TAPRO you need to know the button number you want to change.
Don Bruechert, Voice Comm Analyst II
CareTech Solutions @ Holy Family Memorial
Manitowoc, WI, USA