Packet telephone scheduling with common time reference
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United States of America Patent
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-
Jul 10, 2001
Grant Date -
N/A
app pub date -
Jul 28, 1999
filing date -
Jun 11, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention describes a method for interfacing a packet-switched network with real-time streams from various sources, such as circuit-switched telephony network sources. The network interfaces and gateways maintain a common time reference (CmR), which is obtained either from an external source (such as GPS--Global Positioning System) or is generated and distributed intemally. A data packet that is packetized at the gateway is scheduled to be forwarded to the network in a predfined time that is responsive to the common time reference. The invention relates, in particular, to timely forwarding and delivery of data packet between voice over IP (VoIP) gateways. Consequently, the invention provides a routing service between any two VoIP gateways where the end-to-end performance parameters, such as loss, delay and jitter, have deterministic guarantees. Furthermore, the invention enables gateway functions with minimum delay.
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