CSipSimple is a Voice over Internet Protocol (VoIP) application for Google Android operating system using the Session Initiation Protocol (SIP). Developed by Regis Montoya
License: Open Source
CSipSimple is an open-source SIP client that offers extensive customization and codec support but may be challenging for beginners. In contrast, Ring prioritizes user-friendliness and security, making it suitable for users who value ease of use and privacy.