Voice over IP integration Needs a other device discrimicator other than IP

the voice over IP integration to speak to home assistant needs a better option to discriminate different assistants. Now its one assistant per device, and a Device is a ipv4 address and i have problems with that.

I have a Voip system and not some old phone with a pots to voip connection. I use asterisk I got it working But asterisk has one IP.

So i (or anyone with asterisk) cant make several connections using multiple assistants.

btw isnt using ipv4 not future proof with ipv6 that is needed for matter?