MVP Desk Phone License With No DID

Currently, if a user needs a standard MVP license and uses a desk phone, they MUST have a DID assigned. There are many use cases where you may want to assign a desk phone to a user without using a number from the inventory. This is currently causing a lot of problems in my organization.
I've heard it was previously possible to assign a desk phone without using a DID. I'd like to bring that feature back.