There are many alternatives to CSipSimple for Android and since it's discontinued a lot of people are looking for a replacement. The best Android alternative is Jami, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to CSipSimple and 14 are available for Android so hopefully you can find a suitable replacement. Other interesting Android alternatives to CSipSimple are Linphone, Zoiper, Adamant Messenger and Talkatone.
Open source decentralized communication platform supporting secure end-to-end encrypted calls, messaging, group conferencing, file and media sharing, SIP compatibility, multi-device sync, and strong privacy, available across desktop and mobile systems.
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.
Talkatone gives you free calls, text messages, real-time location sharing and picture sharing to Facebook and Google friends, or any phone number in US.
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.
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.
MizuDroid is an unlocked VoIP softphone for Android mobile phones and tablets based on open standards, compatible with all VoIP providers, software and devices using the SIP protocol.
The Callcentric Android app allows existing Callcentric customers to place calls worldwide using their Callcentric account.
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.
Phoner provides business owner, sales people, lawyers, doctors, police officers and others with a second phone number to protect their identity and also gives the convenience of multiple phone numbers on one device.
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Open Source SIP Voip client that is actively maintained.