I would love to see the "Send to Voicemail" feature enhanced by:
1) Adding a custom outgoing message (seperate from the standard Voicemail message) only when "Send to Voicemal" feature is enabled.
2) Adding the option for incomming callers like "if this is an emergency press the number 1" for a call to be sent through.
I had these features with another VIOP and I founld them very usefully. Plus I had the peace of mind knowing that somebody was able to get ahold of me if there was an emergency.