
Description: FreeSWITCH is an open source telephony platform designed to facilitate the creation of voice and chat driven products scaling from a softphone to a PBX and even up to an enterprise-class softswitch. It can be used to power PBX solutions, voicemail services, conference calling, contact center solutions and more.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: OpenSIPS is an open source SIP proxy and B2BUA server used to build and deploy SIP platforms and VoIP infrastructures. It provides advanced routing, signaling, and session management capabilities for building large scale SIP networks.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API