Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
Patent
1996-12-19
1999-12-21
Nguyen, Chau
Multiplex communications
Pathfinding or routing
Combined circuit switching and packet switching
370410, 370522, 379215, 379216, 379217, 379218, H04L 1228, H04J 312, H04J 316, H04M 342
Patent
active
060058595
ABSTRACT:
System and method for extending the use of a VAT telephony application to originate calls into a PSTN as well as a computer network are disclosed. In a preferred embodiment, an adjunct application, referred to as a VAT signaling program ("VSP") running on the same host computer as a conventional VAT-based telephony application prompts a user to enter a destination telephone number and uses the entered number to generate a Q.931 SETUP message, which is encapsulated in a nonstandard, undefined, VAT control message (the "VAT Q.931 message") created to enable additional signaling information to be sent. A signaling interface to the PSTN serving the designated telephone number signals to the VAT application software exactly as if the signaling interface were actually another VAT application software originating a call to the naive VAT application. The signaling interface waits until the user at the computer "answers," and then originates the call into the PSTN network.
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Network Working Group Audio-Video Transport Working Group, RTP: A Transport Protocol for Real-Time Applications, Jan. 1996, pp. 1-75.
Harvell Joseph
Stovall Gregory T.
Hoosain Allan
Nguyen Chau
Northern Telecom Limited
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