this post was submitted on 22 Oct 2024
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homelab
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Yea, how much do you know about SIP?
I ask because what I would do in this situation is run up a PBX, like FusionPBX, and get the ATA units to connect as an extension to allow calls between them.
No need for a sip trunk to a phone provider as you don't care for external calls.
None, whatsoever but I can learn. I quickly found this opensource project https://www.freepbx.org which has a guide and installation script so maybe a good place to start.