Thirdlane Multi Tenant PBX is described as 'Thirdlane® Multi Tenant PBX Platform is a reliable, cost-effective Multi Tenant IP PBX and Unified Communications software platform with support for voice, messaging, video, integrations Salesforce, Google, Office 365 and other applications'. There are seven alternatives to Thirdlane Multi Tenant PBX for a variety of platforms, including Linux, Mac, Windows, Android and iPhone. The best alternative is Asterisk, which is both free and Open Source. Other great apps like Thirdlane Multi Tenant PBX are 3CX Phone System (Freemium), FusionPBX (Free, Open Source), RingCentral (Paid) and PBXware (Paid).
The MiRTA PBX is an interface written in PHP using Mysql as backend to manage a multitenant PBX built over the Asterisk Open Source PBX. An easy to use interface allows you to manage one or more Asterisk PBX in a multi tenant, load sharing and high availability configuration.