Callcentric is described as 'The Callcentric Android app allows existing Callcentric customers to place calls worldwide using their Callcentric account' and is an app in the social & communications category. There are four alternatives to Callcentric for a variety of platforms, including Mac, Windows, iPhone, iPad and Linux apps. The best Callcentric alternative is Linphone, which is both free and Open Source. Other great apps like Callcentric are FaceTime, MicroSIP and Zoiper.
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.
FaceTime is a video calling software feature developed by Apple for the iOS and Mac OS.
MicroSIP is a free portable SIP softphone for Windows based on PJSIP stack. It allowing to do high quality VoIP calls (P2P or on regular telephones) via open SIP protocol. From cloud of SIP providers you can choose best for you, register account and use it with MicroSIP. You'.
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.
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