
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: PhonerLite is a free, open source softphone and SIP client for making VoIP calls. It supports standard SIP and RTP protocols for compatibility with most VoIP systems. PhonerLite has a simple interface and basic call features like hold, transfer, conferencing.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API