
Description: 3CX is an open-source IP PBX software solution that works with popular SIP phone systems. It offers unified communications features like auto attendants, call routing, voicemail, video conferencing, and more.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: DrayTek SIP SoftPhone is a free VoIP softphone for making and receiving calls over the internet. It supports standard SIP protocol and can integrate with IPPBX systems and SIP trunk providers. Basic features include call history, contacts, call transfer, conference calling.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API