hi @zoom908
BLF is only for desk phones.
the closest equivalent to BLF is Zoom presence which tracks the presence of users accross Zoom services. You can see user presence on Zoom Workplace contacts. You can look at company contacts for all Zoom users on your account and star contacts you want to monitor presence for. The starred contact appear at the top of the contacts. You can click a contact to dial the contact. This screen print shows user Desk 2 is on a call.

Setting your presence status
Did my response answer your question? If so, please don't forget to mark the reply as an accepted solution.
thanks, eliot