3CX is a famous windows-based IP-PBX software provider! It's the only soft IP-PBX that fully support Microsoft Windows OS. 3CX’s IP PBX has been developed specifically for Microsoft Windows and is based on the SIP standard – making it easier to manage and allowing you to use any SIP phone (software or hardware).

Keekey International provide VOIP number that can fully compatible with 3CX phone system. And now Keekey has become an authorized reseller and partner of 3CX to help promote its existance in China!