| 摘要 |
PROBLEM TO BE SOLVED: To easily specify desired line of another key telephone device in accordance with the call-up operation of a user. SOLUTION: In the key telephone device 10B, line management information which shows association between call-up operation in an IP telephone terminal 3B: an outside line 2 and the line of the other key telephone device 10A is stored. Then, a line corresponding to the outside line 2 is confirmed from the line management information in accordance with the call-up operation in the IP telephone terminal 3B and request the calling through the line to the other telephone device 10A which connects the line through a data communication network 52. COPYRIGHT: (C)2008,JPO&INPIT
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