|
KR20070115349A
|
|
Ring back tone providing apparatus, ring back tone providing system and ring back tone providing method
|
|
KR20070028770A
|
|
System and method for interfacing networks
|
|
KR20050028947A
|
|
Apparatus for providing service tone in private branch exchange
|
|
KR20040028271A
|
|
Apparatus for providing tone and digit offering service in private branch exchange
|
|
KR20020081711A
|
|
Analog subscriber matching apparatus for providing a calling identity delivery service
|
|
KR20020064393A
|
|
Analog subscriber interfacing apparatus for providing a calling identity delivery service
|
|
KR20000053778A
|
|
Private branch exchange system capable of extending a digital subscriber line and apparatus therefor
|
|
KR20000053772A
|
|
Interfacing apparatus between a digital phone subscriber pc and a private branch exchange and private branch exchange having the apparatus
|
|
KR20000053773A
|
|
Pravite branch exchange system for extending a digital subscriber line by using 2 wire line and apparatus therefor
|
|
KR20000053767A
|
|
Interfacing apparatus for giving access to a remote digital subscriber for a private branch exchange system
|
|
KR20000053736A
|
|
Private branch exchange system using a data line of a public network and interfacing apparatus therefor
|
