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:
Jul. 27, 2010
Filed:
Dec. 17, 2004
Noboru Yamada, Fukushima-ken, JP;
Kazumasa Azuma, Fukushima-ken, JP;
Kazuhiro Okamoto, Fukushima-ken, JP;
Noboru Yamada, Fukushima-ken, JP;
Kazumasa Azuma, Fukushima-ken, JP;
Kazuhiro Okamoto, Fukushima-ken, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A VoIP gateway apparatus is used to provide an IP centrex service to accommodated devices. The VoIP gateway apparatus () assigns, to a call originated from an accommodated device (PBX), a telephone number for which the number of simultaneous call connections has not reached a simultaneous connection tolerance number, and sends the call to an IP centrex network () with the assigned telephone number used as a calling number. The VoIP gateway apparatus () includes a number-of-calls management part () and a SIP processing part (). The number-of-calls management part () manages the number of the current simultaneous call connections for each of the telephone numbers as assigned to the apparatus. When a call is received from an accommodated device, a SIP processing part () selects, among the telephone numbers as assigned to the apparatus, a telephone number, for which the number of the current simultaneous call connections as managed by the number-of-calls management part () is smaller than the predetermined simultaneous connection tolerance number, and then transmits, to the IP centrex network (), a SIP packet of a call control message to which the selected telephone number has been added as the calling number.