RTP video tunneling through H.221

• US 8,094,667 B2
• Filed: 07/18/2008
• Issued: 01/10/2012
• Est. Priority Date: 07/18/2008
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Cutaia, Nicholas J.
• Primary Examiner(s): Mattis, Jason
• Assistant Examiner(s): SEKUL, MARIA LYNN
• Application Number:
  US12/176,125
• Publication Number:
  US 20100014530A1
• Time in Patent Office: 1,271 Days
• Field of Search: 370/401
• US Class Current: 370/401
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
• CPC Class Codes: H04L 65/103 in the network
• CPC Class Codes: H04L 65/65 Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]

Abstract

A system is provided. The system includes a first gateway operable to receive a real-time protocol (RTP) packet including video data from a first endpoint; and a second gateway operable to communicate with a second endpoint. The first gateway is operable to communicate the RTP packet to the second gateway in a sub-channel portion of an frame-based protocol.

Claims

1. A system comprising:

a first gateway operable to receive a real-time protocol (RTP) packet including video data from a first endpoint; and

a second gateway operable to communicate with a second endpoint,

wherein the first gateway is operable to communicate the RTP packet to the second gateway in a sub-channel portion of a frame-based protocol,

wherein the video data of the RTP packet includes header, sub-header, and payload data and the header, sub-header, and payload data of the RTP packet are copied into the sub-channel portion of the frame-based protocol,

wherein the second gateway is configured to send a capabilities message to the first gateway and the capabilities message defines whether the RTP packet may be copied into the sub-channel portion of the frame-based protocol, and

wherein a tunnel is established between the first gateway and the second gateway based on the capabilities message.

2. The system as claimed in claim 1, wherein the frame-based protocol is an H.221 frame.

5. The system as claimed in claim 2, wherein the second gateway is operable to receive the H.221 frame and detect one or more RTP packet headers.

6. The system as claimed in claim 5, wherein the second gateway is operable to transmit the RTP packet to a terminating endpoint without re-packetization of the RTP packet.

7. The system as claimed in claim 1, wherein the first gateway communicates with the second gateway using an H.320 protocol.

8. The system as claimed in claim 1, wherein the first and second gateways are operable to confirm communication of the RTP packet to the second gateway in the sub-channel portion of the frame-based protocol before or during a video conference.

3. A system comprising:

a first gateway operable to receive a real-time protocol (RTP) packet including video data from a first endpoint; and

a second gateway operable to communicate with a second endpoint,

wherein the first gateway is operable to communicate the RTP packet to the second gateway in a sub-channel portion of a frame-based protocol,

wherein the video data of the RTP packet includes header, sub-header, and payload data and the header, sub-header, and payload data of the RTP packet are copied into the sub-channel portion of the frame-based protocol, and Bit-rate Allocation Signal (BAS) data is used to determine whether the RTP packet is capable of being copied into the sub-channel portion of the frame-based protocol.

4. The system as claimed in claim 3, wherein the BAS data includes a tunneling capabilities message and MTU size command message.

9. A gateway for video data transmission, the gateway comprising:

a memory configured to store a copying program that copies a real time protocol (RTP) packet into a sub-channel portion of a video frame, the RTP packet including a header, a sub-header, and payload data; and

a processor coupled to the memory that executes the copying program and generates a capabilities message,

wherein the memory includes a transmit program that when executed transmits the video frame with the RTP packet in the sub-channel portion to a second gateway,

wherein the capabilities messages provides set up for a video conference tunnel between the gateway and the second gateway.

12. The gateway as claimed in claim 9, wherein the memory includes a setup program that determines whether a second gateway supports receiving RTP tunneling signals and compares the maximum transmission unit (MTU) size of the second gateway to the MTU size of the first gateway.

13. The gateway as claimed in claim 9, wherein the memory includes a header correlation search program that when executed searches the sub-channel portion of the video frame and detects one or more headers of the RTP packet.

14. The gateway as claimed in claim 13, wherein the processor extracts the RTP packets from the data transmitted in the sub-channel portion of the video frame and modifies pertinent RTP header parameters according to negotiations with an endpoint.

10. A gateway for video data transmission, the gateway comprising:

a memory configured to store a copying program that copies a real time protocol (RTP) packet into a sub-channel portion of a video frame, the RTP packet including a header, a sub-header, and payload data; and

a processor coupled to the memory that executes the copying program,

wherein the memory includes a transmit program that when executed transmits the video frame with the RTP packet in the sub-channel portion to a second gateway, wherein the video frame is an H.221 frame.

11. The gateway as claimed in claim 10, wherein the header, sub-header, and payload data are copied into a sub-channel portion of the H.221 frame.

15. A method for video data transmission, the method comprising:

receiving a video packet including header, sub-header, and video data;

setting up a video tunnel with a first communication device according to a tunneling capabilities message received from the first communication device;

copying the header, sub-header and video data of the video packet into a sub-channel portion of an H.221 frame; and

transmitting the H.221 frame to a first communication device using a defined protocol.

16. The method as claimed in claim 15, wherein receiving the video packet includes receiving the video packet from a second communication device using a H.323 protocol, and transmitting includes transmitting the high speed protocol packet to the communication device using a H.320 protocol.

17. The method as claimed in claim 15, wherein setting up the video tunnel includes transmitting the tunneling capabilities message and a MTU size command message from the first communication device to a second communication device.

18. The method as claimed in claim 17, wherein setting up the video tunnel includes confirming that the first communication device is capable of performing a header correlation search process.