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Yes, I understand it's a technical impossibility for a 'vanilla' PSTN phones to ever encrypt or decrypt traffic. But by intra-PBX calling I meant calls that originate and end at PBX extensions using ZRTP-compatible, encryption-capable softphones.

Currently running a small, six-extension FreePBX on a VPS where all extensions use LinPhone Laptop or LinPhone Android VOIP clients. We'd originally selected and deployed on FusionPBX but a VOIP contractor convinced us that E2EE and other features we sought would be more readily deployed and/or...