| 摘要 |
A node device in a communication system including plural node devices connected to a network through a relay device including: a means for establishing and retaining session with a first node device which cannot accept session start; and a means for controlling sending and receipt of a message with respect to another node device where the session is established, wherein the means changes sending source network address information included in the message to network address information of an own node device and transmits the message to an addressed node device, and the means judges whether or not the message is a message to be sent to the first node device except for the first node device, and controls to transmit the message to the first node device in a case where it is a message to be sent to the first node device.
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