Title:
GATEWAY DEVICE, EXTENSION TELEPHONE SWITCHING SYSTEM, AND EXTENSION TELEPHONE SWITCHING METHOD
Document Type and Number:
Japanese Patent JP2005051549
Kind Code:
A
Abstract:
To enable a connection to the Internet to be established without changing the setup of the conventional public network lines while maintaining a representative substitute system of an extension telephone exchange.
In the case of switching between an ISDN 7 and a PBX 1, the ISDN 7 or the Internet 5 is selectively connected to the PBX 1, and the use state of a line to the PBX 1 is detected, and it is reported to a public network that only call origination is performed (a control signal only for call origination is transmitted) in the case that the line to the PBX 1 is busy.
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Inventors:
SON MASAYOSHI
Application Number:
JP2003282080A
Publication Date:
February 24, 2005
Filing Date:
July 29, 2003
Export Citation:
Assignee:
SOFTBANK BB CORP
International Classes:
H04L12/66; H04M3/00; H04M7/00; H04M11/00; H04Q3/58; H04Q3/62; H04Q11/04; H04M3/428; (IPC1-7): H04M3/00; H04L12/66; H04M11/00; H04Q3/58
Attorney, Agent or Firm:
Atsuro Sasaki
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