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    • 2. 发明专利
    • Communication terminal
    • JP2004282578A
    • 2004-10-07
    • JP2003073611
    • 2003-03-18
    • Brother Ind Ltdブラザー工業株式会社
    • SUGIURA HISAO
    • H04M1/00H04M1/247H04M1/2745H04M1/31
    • PROBLEM TO BE SOLVED: To provide a communication terminal which has function which automatically determines a dialing system even if a line automatic selecting apparatus and a private branch exchange are interposed to a public line network, and further has function which can determine a dialing system for free. SOLUTION: A communication terminal 20 transmits a dial signal with either of a PB system and a DP system, and determines dialing system of a contract line by detecting presence or absence of dial tone from a public line network 10 after prescribed time duration passes from performing off-hook. The terminal 20 also transmits a special dial signal to be connected to the public line network 10 even if a PBX 50 and an ACR 60 are interposed, and determines a dialing system by detecting presence or absence of dial tone. Further, the terminal 20 detects presence or absence of connection of the PBX 50, transmits a dial signal after connection to an outside line, and determines a dialing system by detecting presence or absence of dial tone from the public line network 10. COPYRIGHT: (C)2005,JPO&NCIPI