CALL CONTROL METHOD

• Main Author: KITAZAWA KENICHI
• Format: Patent
• Language: English
• Published: 21.10.2010
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TELEPHONIC COMMUNICATION

PROBLEM TO BE SOLVED: To provide a call control method capable of restoring call conditions to stable ones without being brought into locked conditions in a terminal or a server even when the call conditions become unmatched, and keeping call processing such as service expansion after that. SOLUTION: The call control method in a network telephone system includes: a plurality of telephone terminals connected to a communication network for transmitting a sound packet; and a main device for connecting the plurality of telephone terminals to one another via the communication network, and causing the plurality of telephone terminals to communicate with one another. In the call control method, a connection confirmation signal predetermined by a communication protocol on the communication network for confirming presence of connection between the main device and the telephone terminals is transmitted and received between the main device and the plurality of telephone terminals and, based on the transmission and reception results, the main device is changed and the call condition of the main device is matched with those of the plurality of telephone terminals. COPYRIGHT: (C)2011,JPO&INPIT