I have a client that used to be with ESI. Can I re-purpose the ESI phones, reprogram them, and put them on the FreePBX system I set up for them? I am not familiar with ESI, but I have done this with other vendors that have offered cloud-based PBX with Yealink phones.
Nope - Proprietary - and not that great.
If you still have the functioning Key System (the “Box”) that they were attached to, you could front it with FreePBX - But that would be missing out on a TON of features that the ESI doesn’t have.
Sorry.
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