Built-in manufacturer's certificates for a cable telephony adapter to provide device and service certification

A a safety client for IP phone network server and system of LF2407 the key management structure; the password and is allocated balanced a client. The architecture for prior key management protocol Kerberos (public key) and a clamp of extending to provide with a high capacity expansion IP multimedia telephone system with track PKINIT. In output connection ring, structure provides the simple restructuring key operation, is connected or switching of a client thereof is output to different server. The key management structure comprises an IP phone vertex and server and IP phone and method for establishing safety channel. Vertex and user connecting, and server and IP phone coupling network. The method comprising the steps of: A vertex to the support of key distribution centre transmission safety, labelA vertex a key distribution centre and safety, labelTransmitting the support of sub-key from a vertex to server by the safety, labelA sub-key from the server by a vertex; And using sub-key a safety channel between the vertex and server.