Calls - SIP VoIP Softphone is described as 'SIP VoIP softphone app for Android' and is an app in the social & communications category. There are three alternatives to Calls - SIP VoIP Softphone for a variety of platforms, including Android, iPhone, Mac, Windows and Linux apps. The best Calls - SIP VoIP Softphone alternative is Linphone, which is both free and Open Source. Other great apps like Calls - SIP VoIP Softphone are Zoiper and Sipnetic.
Linphone is one of the most famous open source softphones in the world. It is fully SIP-based, for all calling, presence and IM features.
Zoiper IAX & SIP multilanguage and multiplatform (Windows, Linux and Mac OS X) softphone is a VoIP soft client, meant to work with any IP-based communications systems and infrastructure.
Sipnetic is a free VoIP softphone based on the SIP protocol. Sipnetic supports voice and video calls, instant messages, presence information and end-to-end encryption.
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