SESSION CONTROL SERVER AND COMMUNICATION SYSTEM

摘要

A communication device is communicably connected to a session control server via a network and establishes a session with another communication device by transmitting/receiving a signal to/from the session control server. The communication device includes: means for creating a non-symmetric key pair; request means for requesting the session control server to issue a certificate for the public key of the non-symmetric key pair; reception means for receiving notification of public key certificate issuance completion from the session control server; storage means for storing the public key certificate received; transmission means for transmitting a request for registering the position of the communication device to the session control server; and reception means for receiving notification of the position registration completion including a valid term from the session control server. The position registration request and the certificate issuance request are transmitted together as a single request.