ALEXANDRIA, Va., June 17 -- United States Patent no. 12,316,545, issued on May 27, was assigned to Nippon Telegraph and Telephone Corp. (Tokyo).

"Congestion control method, congestion control device, congestion control program" was invented by Fumiaki Nagase (Musashino, Japan), Keita Kuriyama (Musashino, Japan), Yu Ono (Musashino, Japan), Hitoshi Hasegawa (Musashino, Japan), Hayato Fukuzono (Musashino, Japan), Kazuo Osaka (Musashino, Japan), Hiroyuki Furuya (Musashino, Japan), Masafumi Yoshioka (Musashino, Japan), Toshifumi Miyagi (Tokyo) and Takafumi Hayashi (Musashino, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "To avoid uniform deterioration of the voice quality of all the calls sharing an IP pho...