I would like to be able to send a canned audio reply to a caller who is calling on my desk phone when I am at my desk but too busy to answer right now.

When I'm involved in a conversation on my CELL PHONE and my desk phone rings, I would love to be able to send an instant message to the caller with a canned message by pressing buttons on my desk phone. I foresee this sequence as 1) VOIP phone starts ringing, 2) I press a button on the phone that enables one of four canned messages to go out (the phone stops ringing). 3) Using one of the four soft keys under the display I would choose which message would go out, such as "I'm tied up at the moment and will call you back in a few minutes" or "I will call you back later" or "Can you email me your question" or "I will call you back tomorrow". The call would then be routed to VM just in case the caller wanted to leave a message.