SigmaVoIP is the leading provider of Business Unified Communication Solutions based on the 3CX VoIP platform. SigmaVoIP opera ... tes 9 data centers located in the US and Europe and has peering agreements with virtually every Tier 1 carrier. In 2012 SigmaVoIP launched the first sub $1000.00 3CX Powered appliance capable of up to 200 extensions and 32 concurrent calls, this is an industry first. read more