Now that VoIP has become the de facto voice solution for most corporations, the hard part has begun. In particular, determining whether a problem is in a local PBX or in the network is much more. The Yeastar P550 is a new generation of IP PBX — professional, on-premise VoIP phone system. Designed to empower small businesses, P550 supports up to 50 users and 25 concurrent calls. Yealink (Stock Code: 300628) is a global brand that specializes in video conferencing, voice communications and collaboration solutions with best-in-class quality, innovative technology and user-friendly experience. As one of the best providers in more than 140 countries and regions, Yealink ranks No.1 in the global market share of SIP phone shipments (Global IP Desktop.