1
Fen Chung Kung, Jesse Eugene Russell, Hopeton Walker, Spencer Wang: Protected IP telephony calls using encryption. AT&T, May 3, 2005: US06889321 (92 worldwide citation)

Communication information transmitted in the broadband communication system may be in a packet format and secured using encryption techniques, for example encryption software, including a means for providing an initial security key and updated security keys to the various pieces of communication equ ...


2
Fen Chung Kung, Jesse Eugene Russell, Hopeton Walker, Spencer Wang: Protected IP telephony calls using encryption. AT&T Intellectual Property II, June 8, 2010: US07734908 (16 worldwide citation)

Communication information transmitted in the broadband communication system may be in a packet format and secured using encryption techniques, for example encryption software, including a means for providing an initial security key and updated security keys to the various pieces of communication equ ...