For what it is worth - we just moved from Octel to Callpilot, and we are trying to use Octel emulation.
If we had it to do over again we would not bother, it has caused much more confusion and trouble than it is worth. It was never made clear to us that the Octel emulation mode could not access all of the features. It has been much more confusing to explain to users to call one number to check voicemail, then another if they want to setup remote notifcation etc. It would have been much easier to just give them a new list of commands to learn.