The Mizu SIP softswitch is available for free -no limits.
The Mizu compact VoIP server is the first free unlocked softswitch for the Windows platform with business features and a comfortable graphical user interface, with all the goodies from the commercial softswitch edition.

No any artificial limits: use it with unlimited number of users and calls.

With an easy to use installer and configuration wizard you are a few click away to have a feature rich softswitch running on your preferred platform capable to handle all your communication needs such as voice/video calls, chat, presence, SMS with PBX functionalities (transfer, forward, conference, IVR, other), many other features (voice recording, codec transcoding, callback and others) and integrated prepaid/postpaid billing.

Enjoy!

free SOFTSWITCH for windows

The Mizu VoIP Server Compact is a free professional softswitch for the Windows operating system with unlimited usage and a long list of features including business modules such as pricing/billing and a convenient graphical user interface for administrators.
The server is powered by Mizutech Compact VoIP engine with an automated install and configuration wizard.
Unless similar VoIP software for windows, the Mizu VoIP server is user friendly, feature rich, ready to use out of the box and it doesn't have any artificial usage limit: you are free to install it as many time as you wish and there is no any maximum number of users, channels or simultaneous call limits.

Despite its name, the Compact version doesn't mean that this is a simplified release. Actually it contains most of the commercial version features, but using an embedded database and simplified GUI to ease the usage. Use it as a simple SIP proxy, Softswitch or as an IP-PBX depending on your needs.
Features include: SIP, routing, billing, user management, voice calls, video calls, PBX features (hold, forward, transfer, conference and many more), rich codec support (including G.729, HD audio and many more), chat, unified communication, presence, DID, SMS, voice recording and many more.

The softswitch is meant to be used also by non-technical people featuring a comprehensive documentation and intuitive user interface for all the important settings.
This software is free for non-commercial usage. For direct support or commercial usage we encourage you to upgrade to one of our commercial paid license. The commercial version uses a full external SQL engine and a robust scalable core so it is more suitable for VoIP service providers with a high amount of traffic.