Siperb is described as 'WebRTC softphone and WebRTC-to-SIP proxy supporting Asterisk, FreeSWITCH, and SIP PBX environments. Available on Web, Android, iOS, Windows, and Linux with Free, Business, and Business Pro tiers' and is an app in the social & communications category. There are four alternatives to Siperb for a variety of platforms, including Windows, Linux, Mac, Android and iPhone apps. The best Siperb alternative is Linphone, which is both free and Open Source. Other great apps like Siperb are 3CX, 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.
3CX is a software-based, open standards IP PBX that offers complete Unified Communications, out of the box.
Offers a free trial period, after with you need to upgrade to paid subscription.
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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