3CX is a software-based private branch exchange (PBX) system for unified communications that works with popular IP phones, SIP trunks, and Gateways....
Starting at $0 for the standard edition
Best Grandstream UCM Series Alternatives ranked by AI · updated May 2025
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Grandstream UCM Series is a series of IP PBX appliances designed for small to medium businesses. It offers features like video calling, video conferencing, and mobile apps for remote access.
Price: Starting at $299
Top 6 Grandstream UCM Series alternatives
Asterisk is an open-source framework for building communications applications. It turns an ordinary computer into a communications server.
X-Lite is a feature-rich VoIP softphone for Windows and macOS that allows for high-quality audio and video calls.
Free with limited features, Paid version available for advanced features
Zoiper is a VoIP softphone that supports various platforms and offers features like video calling, messaging, and call recording.
Free version available, paid options starting from $39.95
FreePBX is an open-source GUI (graphical user interface) that controls and manages Asterisk (PBX), an open-source communication server.
MicroSIP is a lightweight open-source VoIP softphone for Windows. It allows for easy voice and video calls over the Internet.
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