1
Fen Chung Kung, Jesse Eugene Russell, Hopeton Walker, Spencer Wang: Personal user network (closed user network) PUN/CUN. AT&T, June 26, 2001: US06252952 (274 worldwide citation)

An Internet Protocol Telephony Network and public switched telephone network, in which closed user groups may be dynamically defined and modified to take advantage of special billing within the closed user groups. Abbreviated dialing within the closed user groups may also be used to make dialing mor ...


2
Fen Chung Kung, Russell Jesse Eugene, Walker Hopeton, Wang Spencer: Reseau dutlisateurs ferme, Personal user network (closed user network) pun/cun. At&T, At&T, KIRBY EADES GALE BAKER, April 15, 2003: CA2326267

An Internet Protocol Telephony Network and public switched telephony network, in which closed user groups may be dynamically defined and modified to take advantage of special billing within the closed user groups. Abbreviated dialing within the closed user groups may also be used to make dialing mor ...