Open source solution for cloud-based multi-tenant PBX?

From my point of view, no, FreePBX makes a lousy multi-tenant solution, but is an excellent PBX for a single client, I would spin up separate instances of FreePBX for each client, and channel all calls through a real SIP proxy like Kamailio.

In this day and age of virtualization, everything above is feasible and open source if you don’t need clever things or you are yourself clever.

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