Linphone is described as 'Is one of the most famous open source softphones in the world. It is fully SIP-based, for all calling, presence and IM features' and is a very popular instant messenger in the social & communications category. There are more than 50 alternatives to Linphone for a variety of platforms, including Android, iPhone, Windows, Mac and iPad apps. The best Linphone alternative is SimpleX Chat, which is both free and Open Source. Other great apps like Linphone are Jami, Jitsi Desktop, Molly and FluffyChat.
Silent Phone – Secure Encrypted Video & Voice Mobile Phone Calls
You now have the ability to have secure encrypted phone calls between Silent Circle members, anywhere, anytime, with complete control.
Make a secure call as easy as an ordinary call and be sure of real safety.
Free, native Windows SIP softphone with HD audio, SRTP encryption, multi-account support and a C# Plugin SDK. Works with any SIP provider.
Softphone.Pro is a SIP softphone compatible with any PBX and CRM, and any industry software.
jami-commander (jc for short) is a simple but convenient CLI-based Jami client app for setting up accounts and swarms as well as sending.
The project seems no longer developed since 2019. Last version, 2.6.6, released in October 2019, can be still downloaded from F-Droid, it's no longer available on Google Play Store
Tragofone - a white-label softphone backed by WebRTC and auto-provisioning is a perfect choice to maintain uninterrupted business communication anywhere, anytime.
Fully end-to-end encrypted business collaboration platform that is the only on the market supporting E2EE HD video conference up to 100 participants.
The Callcentric Android app allows existing Callcentric customers to place calls worldwide using their Callcentric account.
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.
With BiP, you can send pictures and videos, documents, audio files, locations as well as text messages. Holding the microphone button is enough to send the audio recording.?
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Xabber is not a soft phone solution, only instant messaging.