Patent ID: 9602768
Date: 2017-03-21
CPC Classifications: H04L,H04M,H04N

Claim:
1. A management system, comprising: a memory that stores a candidate list for each one of a plurality of transmission terminals, the candidate list associating identification information of one or more candidate counterpart terminals each capable of communicating with the transmission terminal, with identification information of the transmission terminal; a receiver that receives, from a first transmission terminal, a deletion request for deleting identification information of a second transmission terminal of the plurality of transmission terminals from the candidate list of the first transmission terminal of the plurality of transmission terminals; processing circuitry that deletes, in response to the deletion request for deleting identification information of the second transmission terminal received from the first transmission terminal, the identification information of the second transmission terminal from the candidate list of the first transmission terminal and further deletes identification information of the first transmission terminal from a candidate list of the second transmission terminal; and a transmitter that transmits, to the second transmission terminal, a first notification indicating that the identification information of the first transmission terminal has been deleted from the candidate list of the second transmission terminal together with operation state information indicating a current operation state of the first transmission terminal.