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Best Choice Grandstream 
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Grandstream UCM6302 IP PBX 2FXO, 2FXS Appliance Supports up to 3000 users and up to 450 concurrent callsBest Value 
PBX, VoIP, and Modern Digital Calling Systems: A Comprehensive Guide Grandstream 
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Grandstream GXP1625 2 SIP Accounts HD Audio 2 Line IP Phone 2 SIP accounts, 2 line keys, 3-way conferencingCablesys 
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