
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: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: tSIP is an open source SIP softphone and SIP client for making VoIP calls and sending instant messages over the Internet. It supports standard SIP features like audio/video calling, instant messaging, presence, and more.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API