CSipSimple is not available for Windows but there are plenty of alternatives that runs on Windows with similar functionality. The best Windows alternative is Jitsi, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to CSipSimple and 11 are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to CSipSimple are Jami (Free, Open Source), Hangouts (Free), Linphone (Free, Open Source) and MicroSIP (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.
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Jitsi vs CSipSimple opinions
pros, cons and recent comments
Wireball Jitsi Meet for Android, at least, cannot be configured as a sip client - it only has one entry - "https server" - and that's it.
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.
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.
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Linphone vs CSipSimple opinions
Most users think Linphone is a great alternative to CSipSimple.
nrg200 Open Source SIP Voip client that is actively maintained.
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.