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3CX Announces Partnership with Canadian VoIP Provider RingOffice LONDON, UK and TORONTO, CANADA 16 APRIL 2015 – 3CX, developer of the award-winning Windows VoIP PBX 3CX Phone System, announces that the interoperability testing with the Canadian VoIP Service Provider, RingOffice, has proven successful, allowing 3CX customers to use RingOffice as their...