trixbox Pro™ offers VoIP-users a PSTN back-up in case of an Internet service interruption. Virtual PBX products offer no PSTN back-up, so, if your Internet service goes down (there is no 100% guaranteed up-time), your business telephone line goes down with it — which is unacceptable in a dynamic business environment.

PSTN-Fallback is automatic. trixbox Pro™ detects poor (or zero) Internet quality and immediately steps your system into PSTN mode.

Note: trixbox Pro™ runs in PSTN-only mode if desired. No VoIP required!