The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 07, 2008
Filed:
Sep. 11, 2002
Sang Yun Lee, Seongnam-si, KR;
Hee Hyeok Hahm, Seoul, KR;
Tae Wook Park, Seoul, KR;
Ki Mun Kim, Incheon-si, KR;
Sang Yun Lee, Seongnam-si, KR;
Hee Hyeok Hahm, Seoul, KR;
Tae Wook Park, Seoul, KR;
Ki Mun Kim, Incheon-si, KR;
SK Telecom Co., Ltd., Seoul, KR;
Abstract
The present invention relates to apparatus and method of providing a history of failed calls for a subscriber who is targeted by the failed calls. In the present invention, when an exchanger can not route a call to a target subscriber it notifies an HLR (Home Location Register) of call routing failure. Then, the HLR sends information about the failed call, which includes the called and the calling number, and call originating time (or call receiving time), to a call control system. The call control system adds the received failed-call information to a calling history for the called number. Afterwards, when the called number is accessible the call control system provides a subscriber of the called number with the calling history, whereby the subscriber can know all of calling numbers that requested to make connections with him or her while he or she was not able to communicate with a mobile network.