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US 6,771,763 B1Granted
Method and apparatus for providing efficient VoDSL gateway-to-gateway communication
AssigneeLucent Technologies Inc.
InventorsHassan Hagirahim, Francis Waldman
Life of this patent
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Abstract
The invention comprises a system and method for transmitting and receiving VoDSL voice traffic that avoids, where possible, the transcoding of a speech signal multiple times. The invention advantageously provides enhanced Quality of Service (QoS) by opportunistically avoiding signal degradation where VoDSL to VoDSL gateway communications may be provided.
Claims20
A method of transporting voice traffic from a Voice over Digital Subscriber Line (VoDSL) gateway, over a Public Switched Telephone Network (PSTN), to a destination, said method comprising:
- receiving compressed voice traffic at said VoDSL gateway;
- determining whether said destination is serviced by a second VoDSL gateway by communicating a signaling message on at least one of a plurality of logical links dedicated to carrying signaling messages between said VoDSL gateway and said second VoDSL gateway via a Digital Signal level Zero (DS0) channel, wherein in response to a connect message said first VoDSL gateway communicates a VoDSL GWY message encapsulated in a V.120 packet to said second VoDSL gateway, and wherein said VoDSL GWY message comprises a call reference, a calling party telephone number, a called party telephone number, and a voice compression rate indicator;
- and
- transporting said compressed voice traffic to said second VoDSL gateway utilizing a plurality of transport packets, responsive to an affirmative determination that said destination is serviced by said second VoDSL gateway.
1 more element
In a communication system, apparatus comprising:
- a first VoDSL gateway, for communicating voice traffic between a first subscriber and a second subscriber via a Public Switch Telephone Network (PSTN);
- said first VoDSL gateway, in response to a second VoDSL gateway communicating a signaling message via said PSTN, transmits said voice traffic within a plurality of transport packets to said second VoDSL gateway, said signaling message being carried over at least one of a plurality of logical links dedicated to carrying signaling messages between gateways via a Digital Signal level Zero (DS0) channel, said signaling messages comprising:
- a connect message from said second VoDSL gateway to said first VoDSL gateway, and in response to said connect message, a VoDSL GWY message from said first VoDSL gateway to said second VoDSL gateway, wherein said VoDSL GWY message comprises a call reference, a calling party telephone number, a called party telephone number, and a voice compression rate indicator;
- and
- said first VoDSL gateway, in response to a failure to detect a second VoDSL gateway, encoding and transmitting said voice traffic to second subscriber in a conventional manner.
2 more elements
Dependencies are inferred from the claim text.