Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
Reexamination Certificate
2007-12-04
2007-12-04
Pham, Chi (Department: 2616)
Multiplex communications
Pathfinding or routing
Combined circuit switching and packet switching
C370S493000, C709S245000
Reexamination Certificate
active
10624255
ABSTRACT:
A communication management system operates with a packet switched local area network and includes a PSTN interface for communicating over a telephone line with a service provider central office. The system comprises means for establishing a logical channel over the packet switched local area network to support a real time communication session with a real time communication device in response to receiving session signaling from the real time communication device; means for controlling the PSTN interface to transition the telephone line to an off hook state in response to receiving session signaling; and translation means for providing digital audio over the logical channel, the digital audio representing a dial tone received on the telephone line from the central office and providing one of a plurality of dual tone multi frequency signals on the telephone line in response to receipt of data from the real time communication device corresponding to the one of a plurality of dual tone multi frequency signals.
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patent: 7120122 (2006-10-01), Starr et al.
patent: 2001/0012305 (2001-08-01), Kozdon et al.
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Adams Christopher Lyle
Lewis Calvin E
Nebiker Robert M
Ross Rodney A
Sojka Marvin L
Chou Albert T.
Hagan Timothy P. O
Pham Chi
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