
Description: Telephone is an open source SIP softphone and VoIP client for making audio and video calls over the internet. It supports standard telephony features like call waiting, call forwarding and voicemail.
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