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Best Choice Grandstream 
Grandstream UCM6300A IP-PBX Phone System Supports up to 3000 usersGrandstream 
Grandstream UCM6302 IP PBX 2FXO, 2FXS Appliance Supports up to 3000 users and up to 450 concurrent callsBest Value Tiptel 
Yeastar S50 VoIP PBX Phone System 50 SIp extensionsYEASTAR 
Yeastar P550 IP PBX System Intuitive user interface for easy adoption and managementGrandstream 
Grandstream GXP1625 2 SIP Accounts HD Audio 2 Line IP Phone 2 SIP accounts, 2 line keys, 3-way conferencingIndependently published 
PBX, VoIP, and Modern Digital Calling Systems: A Comprehensive Guide Grandstream 
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