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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 Grandstream Grandstream UCM6302 IP PBX 2FXO, 2FXS Appliance Supports up to 3000 users and up to 450 concurrent callsTiptel 
Yeastar S50 VoIP PBX Phone System 50 SIp extensionsGrandstream 
Grandstream UCM6308 IP PBX Supporting Full-Band Opus Voice Codec Telephone System Zero configuration provisioning of SIP endpointsPanasonic 
Panasonic DECT Digital Cordless Phone with Built-in Answering Machine and 3 Handsets (KX-TG6823ALB) Black & Silver Noise Reduction - reduce the background noise of the other party when it's difficult to hear; simply by pressing the dedGrandstream 
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