Systems and method for multicasting a video stream and communications network employing the same

Claim 2

For use in a communications network having a source and destination endpoint that employs a video transmission protocol in which said destination endpoint of a video stream receives a release command from said source endpoint of said video stream to begin displaying said video stream, said destination endpoint normally receiving said release command only after completion of a capabilities negotiation between said destination endpoint and said source endpoint, a method of multicasting said video stream from said source endpoint to at least one destination endpoint, to comprising the steps of: beginning said multicasting of said video stream; ignoring any capabilities messages received from said at least one destination endpoint during said multicasting of said video stream; and issuing periodic release commands during said multicasting of said video stream irrespective of receipt times of said ignored capabilities messages, said at least one destination endpoint thereby commanded to begin to display said video stream following a simulation of said capabilities negotiation.

Claim 3

The method as recited in claim 1 wherein said video stream is ITU-T H.261/H.263 encoded.

Claim 4

The method as recited in claim 1 wherein said video stream is arranged into ITU-T H.221/H.223 frames.

Claim 5

The method as recited in claim 1 wherein said at least one destination endpoint is in a freeze picture state prior to receiving one of said release commands.

Claim 6

The method as recited in claim 1 wherein said at least one destination endpoint is released to display said video stream at different times during said multicasting of said video stream.

Claim 7

The method as recited in claim 1 wherein said communications network is selected from the group consisting of: an Asynchronous Transfer Mode (ATM) network; a Private Switched Network; and a Public Switched Network.

Claim 8

The method as recited in claim 1 wherein said release command is contained within a logical data channel of a frame transmittable through said communications network.

Claim 9

The method as recited in claim 1 wherein said video stream is created in real time.

Claim 10

The method as recited in claim 1 wherein said method is performed be executing a sequence of executable software instructions.

Claim 11

The method as recited in claim 1 wherein said method is embodied, at least in part, as executable code and stored in a storage device.

Claim 12

For use in a communications network having a source and destination endpoint that employs a video transmission protocol in which said destination endpoint of a video stream receives a release command from said source endpoint of said video stream to begin displaying said video stream, said destination endpoint normally receiving said release command only after completion of a capabilities negotiation between said destination endpoint and said source endpoint, a system for multicasting said video stream from said source endpoint to at least one destination endpoint, comprising: a video transmission circuit that begins said multicasting of said video stream, said source endpoint ignoring any capabilities messages received from said at least one destination endpoint during said multicasting of said video stream; and a command issuance circuit that issues periodic release commands during said multicasting of said video stream irrespective of receipt times of said ignored capabilities messages, said at least one destination endpoint thereby commanded to begin to display said video stream following a simulation of said capabilities negotiation.

Claim 13

For use in a communications network having a source and destination endpoint that employs a video transmission protocol in which said destination endpoint of a video stream receives a release command from said source endpoint of said video stream to begin displaying said video stream, said destination endpoint normally receiving said release command only after completion of a capabilities negotiation between said destination endpoint and said source endpoint, a system for multicasting said video stream from said source endpoint to at least one destination endpoint, comprising: a video transmission circuit that begins said multicasting of said video stream, said source endpoint ignoring any capabilities messages received from said at least one destination endpoint during said multicasting of said video stream; and a command issuance circuit that issues periodic release commands during said multicasting of said video stream irrespective of receipt times of said ignored capabilities messages, said at least one destination endpoint thereby commanded to begin to display said video stream following a simulation of said capabilities negotiation.

Claim 14

The system as recited in claim 11 wherein said video stream is ITU-T H.261/H.263 encoded.

Claim 15

The system as recited in claim 11 wherein said video stream is arranged into ITU-T H.221/H.223 frames.

Claim 16

The system as recited in claim 11 wherein said at least one destination endpoint is in a freeze picture state prior to receiving one of said release commands.

Claim 17

The system as recited in claim 11 wherein said at least one destination endpoint is released to display said video stream at different times during said multicasting of said video stream.

Claim 18

The system as recited in claim 11 wherein said communications network is selected from the group consisting of: an Asynchronous Transfer Mode (ATM) network; a Private Switched Network; and a Public Switched Network.

Claim 19

The system as recited in claim 11 wherein said release command is contained within a logical data channel of a frame transmittable through said communications network.

Claim 20

The system as recited in claim 11 wherein said video stream is created in real time.

Claim 21

The system as recited in claim 11 wherein said at least one destination endpoint employs a processor and storage device to display said video stream.

Claim 22

The system as recited in claim 11 wherein said system is embodied, at least in part, as executable code, stored in a storage device and executed in a processor.

Claim 23

A communications network, comprising: a distribution system; a plurality of endpoints coupled together via said distribution system for video stream communication thereamong, said plurality of endpoints capable of being alternatively designated as source endpoints or as destination endpoints; and an operating system and associate driver circuitry that enables use of a video transmission protocol by said source and destination endpoints in which said destination endpoint of a video stream receives a release command from said source endpoint of said video stream to begin displaying said video stream, said destination endpoint normally receiving said release command only after completion of a capabilities negotiation between said destination endpoint and said source endpoint, said operating system and associate driver circuitry, comprising: a video transmission circuit, associated with said source endpoint, that begins said multicasting of said video stream over said distribution system, said source endpoint ignoring any capabilities messages received from potential destination endpoints during said multicasting of said video stream; and a command issuance circuit that issues periodic release commands during said multicasting of said video stream irrespective of receipt times of said ignored capabilities messages, multiple destination endpoints thereby commanded to begin to display said video stream following a simulation of said capabilities negotiation, said video transmission circuit and said command issuance circuit thereby cooperating to allow multicasting of said video stream from said source endpoint to said multiple destination endpoints.

Claim 24

A communications network, comprising: a distribution system; a plurality of endpoints coupled together via said distribution system for video stream communication thereamong, said plurality of endpoints capable of being alternatively designated as source endpoints or as destination endpoints; and an operating system and associate driver circuitry that enables use of a video transmission protocol by said source and destination endpoints in which said destination endpoint of a video stream receives a release command from said source endpoint of said video stream to begin displaying said video stream, said destination endpoint normally receiving said release command only after completion of a capabilities negotiation between said destination endpoint and said source endpoint, said operating system and associate driver circuitry, comprising: a video transmission circuit, associated with said source endpoint, that begins said multicasting of said video stream over said distribution system, said source endpoint ignoring any capabilities messages received from potential destination endpoints during said multicasting of said video stream; and a command issuance circuit that issues periodic release commands during said multicasting of said video stream irrespective of receipt times of said ignored capabilities messages, multiple destination endpoints thereby commanded to begin to display said video stream following a simulation of said capabilities negotiation, said video transmission circuit and said command issuance circuit thereby cooperating to allow multicasting of said video stream from said source endpoint to said multiple destination endpoints.

Claim 25

The communications network as recited in claim 21 wherein said video stream is ITU-T H.261/H.263 encoded.

Claim 26

The communications network as recited in claim 21 wherein said video stream is arranged into ITU-T H.221/H.223 frames.

Claim 27

The communications network as recited in claim 21 wherein said multiple destination endpoints are in a freeze picture state prior to receiving one of said release commands.

Claim 28

The communications network as recited in claim 21 wherein said multiple destination endpoints are released to display said video stream at different times during said multicasting of said video stream.

Claim 29

The communications network as recited in claim 21 wherein said communications network is selected from the group consisting of: an Asynchronous Transfer Mode (ATM) network; a Private Switched Network; and a Public Switched Network.

Claim 30

The communications network as recited in claim 21 wherein said release command is contained within a logical data channel of a frame transmittable through said communications network.

Claim 31

The communications network as recited in claim 21 wherein said video stream is created in real time.

Claim 32

The communications network as recited in claim 21 wherein said multiple destination endpoints employ a processor and storage device to display said video stream.

Claim 33

The communications network as recited in claim 21 wherein said operating system and associate driver circuitry is embodied, at least in part, as executable code, stored in a storage device and executed in a processor.