Issabel

Issabel is a unified communications platform built to consolidate all of an organisation's communications onto a single system rather than running voice, messaging and fax as separate services.

Its feature range is broader than a telephone system, covering call centre operation, email management, reporting, fax, video call meetings, audio recording and CRM and platform integrations. Including fax alongside video conferencing is a fair reflection of what many organisations actually still need, particularly in healthcare, legal and government contexts where fax remains a required channel long after everyone stopped wanting it.

The surrounding services are unusually well defined for an open source derived platform. Support handles issue resolution and unplanned configuration remotely, covering everything from configuration procedures through to project deployment estimation regardless of location. Including deployment estimation matters because sizing and planning is where most self-hosted PBX projects go wrong before any software is installed.

A structured training programme builds the knowledge to operate Issabel step by step, which addresses the real constraint on open source telephony: the software is free but the expertise is not, and an organisation without it cannot maintain what it deploys. An addon ecosystem extends functionality with solutions that integrate with the telephony layer to improve customer service. Pricing is not published, with the core platform open source.