BLF presence on separate systems?

I’ve got a 2 site customer, each with their own freepbx system. Can site 1 show the presence (BLF) of extensions on site 2’s system?

Which version freepbx and asterisk do you use in each system?

Version 13 for each system.

My heart says “there must be” but (unless you have the phone registered on both servers) I can’t think of a clean way to do it.

Digium’s heart says

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