SessionTalk SIP Softphone is described as 'With a superbly designed and intuitive user interface, the softphone offers easy set up with lots of preconfigured VoIP providers built in and smart call management features. Enjoy high quality enterprise communication features with zero effect on battery life' and is an app in the Social & Communications category. There are more than 50 alternatives to SessionTalk SIP Softphone for a variety of platforms, including Android, iPhone, Windows, Mac and Android Tablet. The best alternative is Jitsi, which is both free and Open Source. Other great apps like SessionTalk SIP Softphone are Tox (Free, Open Source), Wire (Free Personal, Open Source), Jami (Free, Open Source) and Conversations (Free, Open Source).
Jitsi (previously SIP Communicator) is an audio/video and chat communicator with full encryption that supports protocols such as SIP, XMPP/Jabber, ICQ/AIM, Windows Live, Yahoo!, GTalk/Hangouts extensions, as well as OTR, ZRTP, etc.
Wire is the most secure collaboration platform featuring messenger, voice, video, conference calls, file-sharing, and external collaboration –all protected by the most secure end-to-end-encryption. Why Wire?
Jami (formerly GNU Ring, SFLphone) positions itself as a potential free Skype replacement Open Source and cross-platform. Jami gives you a full control over your communications and an unmatched level of privacy.
Conversations is a privacy focused, open source XMPP Texting [Jabber] client for Android 4.0+ smart phones with wife-approved easy encryption [OTR, OMEMO, or GPG]. [Note] **You can download the compiled apk for free from F-Droid**: ...
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. Use Linphone for free, and enjoy its intuitive interface and advanced features with our free SIP service or with an existing SIP account.
Cross-platform - Get closer to everyone you love with simple, high-quality video calling on iOS and Android. Make one-to-one calls - See who’s already available to connect on Duo or invite a friend to join.