Patent ID: 8270971
Filing Date: 2012-09-18
Classification: H04L,H04W

Abstract:
1. A communication system where two or more portable terminal devices into which a user information storing unit to which information about a user is registered is inserted make a communication via a switch by performing an incoming/outgoing operation using incoming/outgoing information registered to the user information storing unit, the communication system comprising: a portable terminal device configured to obtain first identification information, assigned to each user information storing unit, from a first user information storing unit upon detection of the first user information storing unit, configured to store the first identification information in a user information history storing unit, configured to obtain the first identification information, and second identification information registered to a second user information storing unit, inserted immediately before the first user information storing unit, from the user information history storing unit, configured to notify the switch of both of the first identification information and the second identification information when the first identification information and the second identification information do not match, and configured to initialize predetermined data within a storing unit included in the portable terminal device itself in accordance with an instruction from the switch; and a switch configured to search for the second identification information in an initialization target storing unit that is a storing unit to which a portable terminal device to be initialized is registered upon receipt of the notification and which is intended to register the identification information registered to the user information storing unit inserted into the portable terminal device, configured to replace the second identification information with the first identification information upon detection of the second identification information, and configured to instruct the portable terminal device into which the user information storing unit to which the first identification information is registered is inserted to initialize data.