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
Founded in 2000, ATOP Technology is an innovative manufacturer based in Shenzhen, China, specializing in researching, designing and production of network communication products. As one of the early network equipments makers, ATOP Technology has undergone
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