This is a Voice over Internet Protocol (VoIP) and streaming media service based on the Session Initiation Protocol (SIP) by which Internet telephony service providers (ITSPs) deliver telephone services and unified communications to customers equipped with SIP-based private branch exchange (IP-PBX) and Unified Communications facilities
Provide VoIP connection worldwide. Free calls to China mobile and landline, landline UK, USA, Canada, Moscow, St-Petersburg. 30 days money back guarantee.