I have a client who wants to be able to, while in Unity to enter # then an extension to go to someones voicemail directly from the Unity auto attendant. They still want to be dial the users extension to transfer to them like normal, but would also like ability to just leave them a voicemail without transferring to their phone, etc.
I don't think there is a way to do this, other then a ugly way which is not very manageable. That way would be to have say another extension for the user with a prefix of something, so when they called that other number from within unity it would go to the greeting of said subscriber. However this would require a call handler for each user.