There are many alternatives to Asterisk for Windows if you are looking for a replacement. The best Windows alternative is 3CX Phone System, which is free. If that doesn't suit you, our users have ranked more than 25 alternatives to Asterisk and 11 are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to Asterisk are Wazo (Free, Open Source), FreeSWITCH (Free, Open Source), RingCentral (Paid) and miniSIPServer (Paid).
FreeSWITCH is a scalable open source cross-platform telephony platform designed to route and interconnect popular communication protocols using audio, video, text or any other form of media. It was created in 2006 to fill the void left by proprietary commercial solutions.
You will be able to setup your own VOIP system in ONE HOUR. miniSIPServer can run on Windows, Linux and even Raspberry Pi. We can also run it on kinds of virtual machine systems, such as Hyper-V, VMWare, KVM, Xen.
Ozeki Phone System XE is a Software PBX telephony platform for Windows. Ozeki enables your applications to connect PBX and access IVR, Webphone, SMS sending, 3D video calls and other functionalities. It makes possible to use PHP VOIP, .
uContact is an All in One contact center solution that includes ACD, recording, dialers (preview, power and predictive), Social Networks, CRM, WFM, quality, call reporting, live monitoring, IVR, SMS, Web Chat with audio and video, Gamification, etc.