Patent ID: 7779131
Filing Date: 2010-08-17
Classification: H04L

Abstract:
1. A server connected to an IP network, the server comprising: an IP version storage section which stores an IP version implemented in a destination terminal under the control of the server; a message receiving section for receiving a message for establishing a session between a source terminal and the destination terminal from the source terminal; an IP version acquisition section for acquiring the IP version implemented in the destination terminal corresponding to the message from the IP version storage section; an IP version comparison section for comparing an IP version which is implemented in the source terminal and which is included in the message with the IP version which is implemented in the destination terminal and which is acquired by the IP version acquisition section; and a comparison result sending section for sending a result of the comparison by the IP version comparison section to an address converter which makes an address conversion so that IP versions of data frames exchanged between the source terminal and the destination terminal will match, wherein the comparison result sending section uses an unused response code prescribed for a SIP session as a response message which indicates that the IP versions differ as the result of the comparison.