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:
May. 27, 2025
Filed:
Jun. 08, 2020
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Fumiaki Nagase, Musashino, JP;
Keita Kuriyama, Musashino, JP;
Yu Ono, Musashino, JP;
Hitoshi Hasegawa, Musashino, JP;
Hayato Fukuzono, Musashino, JP;
Kazuo Osaka, Musashino, JP;
Hiroyuki Furuya, Musashino, JP;
Masafumi Yoshioka, Musashino, JP;
Toshifumi Miyagi, Tokyo, JP;
Takafumi Hayashi, Musashino, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
To avoid uniform deterioration of the voice quality of all the calls sharing an IP phone line at a time of congestion. The congestion control method in an IP phone system includes a call state acquisition process of acquiring the number of simultaneous call sessions in one line shared by a plurality of IP phones. A congestion control method further includes a packet loss control process of setting a priority ranking to each call session and dynamically controlling packet loss rates of the call sessions in accordance with the number of the simultaneous call sessions and the priority ranking. In the packet loss control process, the packet loss rate is set lower for call sessions ranked higher in priority, and higher for call sessions ranked lower in priority.