Is it possible to configure Unity to ask the question, 'if you want to dial an extension, dial it now',
collect the digits and forward the call the required number
There are several conversation threads discussing non-subscriber transfer options. Here's one of them:
If you have a lot of DN's that aren't Unity subscribers, you can create Internet subscribers which don't eat up a license/mailbox, etc. and can be transferred to.
Hope that helps,
I am not sure on that. I know the caller system transfer dialog will allow users to transfer to an extension on ccm that is not in unity but you may need to send callers to that from the call handler.