Signaling referring to setup of H.324 video telephone between media gateway and controller

Patent metadata

Field	Value
Publication number	US-9614714-B2
Application number	US-8387406-A
Country	US
Kind code	B2
Filing date	Sep 8, 2006
Priority date	Oct 21, 2005
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

A video telecommunication connection is established via a landline telecommunications network and an IP multimedia subsystem telecommunications network using a media gateway control function of at least one Internet multimedia-media gateway device in the IP multimedia subsystem telecommunications network. An H.223 multiplex level usable for a telecommunication connection is exposed to an H.223 protocol negotiation, in carrying out an H.245 protocol negotiations for setting up the H.223 protocol negotiations connection for a telecommunication connection. A media gateway control function device is informed when the H.223 logic channels are open by H.245 signaling, thereby enabling the Internet multimedia-media gateway device of the IP multimedia subsystem telecommunications network to carry out at least part of the setup.

First claim

The invention claimed is:

1. A method for setting up a video or multimedia call, which, after being set up, runs by way of a circuit-switched telecommunications network and by way of another telecommunications network which utilizes session initiation protocol for signaling, said method comprising:
sending, by a media gateway control device to a media gateway device, a message instructing the media gateway device to conduct inband negotiations with the circuit-switched telecommunications network, the message including video codecs usable for video or multimedia telephony, the media gateway control device sending only codecs to the media gateway device that are supported at the media gateway device, the media gateway control device being provided for interworking between the circuit-switched telecommunications network and the other telecommunications network concerning signaling and the media gateway device being provided for interworking between the circuit-switched telecommunications network and the other telecommunications network concerning bearer, the media gateway device being included in the other telecommunications network; and
setting up the video or multimedia telecommunications call by conducting, by the media gateway device, the in band negotiations based on the instructions from the media gateway control device,
wherein the circuit-switched telecommunications network includes a 3rd Generation Partnership Project circuit-switched domain or a public switched telephone network, and
wherein the other telecommunications network includes an Internet protocol multimedia sub system telecommunications network.

2. The method as claimed in claim 1 ,
wherein the media gateway control device is part of the Internet protocol multimedia sub system telecommunications network, and
wherein said instructing of at least the media gateway device by the media gateway control device and said carrying out at least the inband negotiations by the media gateway device include
implementing an H.223 protocol negotiation of an H.223 multiplex level to be used for the video telecommunications connection in the Internet protocol multimedia subsystem telecommunications network;
subsequently implementing, for setup of an H.324 video telecommunications connection in the circuit-switched telecommunications network, an H.245 protocol negotiation referring to the video codecs usable for video or multimedia telephony; and
informing the media gateway control device as soon as H.223 transport channels
for the video telecommunications call have been opened by using an H.245 signaling operation.

3. The method as claimed in claim 2 , wherein said instructing includes giving instructions if the media gateway control device detects or assumes based on call control signaling during call setup that video telephony as defined by the H.324 protocol is required by the circuit-switched telecommunications network.

4. The method as claimed in claim 3 , further comprising configuring the media gateway device by the media gateway control device using H.248 add or modify messages, when establishing termination in charge of handling of the H.223 multiplex level.

5. The method as claimed in claim 4 , further comprising inserting, by the media gateway control device, at least one H.248 signal in messages to the media gateway device, indicating that the H.223 and/or H.245 negotiation should be implemented.

6. The method as claimed in claim 5 , further comprising:
demanding a first notification about the setup of logical H.223 channels, by the media gateway control device inserting a first H.248 event into a first H.248 message to the media gateway device; and
notifying the media gateway control device by the media gateway device utilizing a first H.248 notify message specifying the first H.248 event if a logical H.223 channel is opened by using H.245 signaling.

7. The method as claimed in claim 6 , further comprising specifying, by the media gateway device, a selected codec and a logical channel number in the first notification about opening of the logical H.223 channel, as parameters of the event used in the first notification.

8. The method as claimed in claim 7 , further comprising
notifying the media gateway control device by the media gateway device if the H.223 negotiation of the multiplex level has been terminated or has failed.

9. The method as claimed in claim 8 , further comprising:
demanding a second notification about the H.223 negotiation of the multiplex level from the media gateway control device utilizing a second H.248 event which the media gateway control device inserts in a second H.248 message to the media gateway device; and
notifying the media gateway control device by the media gateway device utilizing a second H.248 notify message specifying the second H.248 event if the logical H.223 channel is opened by using H.245 signaling.

10. The method as claimed in claim 9 , further comprising instructing the media gateway device under control of the media gateway control device to pass on the data channel transparently when the connection setup is forwarded by the Internet protocol multimedia subsystem telecommunications network to another media gateway control device in a call setup from the circuit-switched network side by the media gateway control function device in the direction of the Internet protocol multimedia subsystem telecommunications network.

11. The method as claimed in claim 10 , further comprising implementing the H.245 procedures for master-slave determination autonomously by the media gateway device.

12. The method as claimed in claim 11 , further comprising sending and receiving H.245 terminal capability set messages autonomously by the media gateway device.

13. The method as claimed in claim 12 ,
wherein the transfer of codecs between the media gateway control device and the media gateway device is omitted, and
wherein said method further comprises selecting, by the media gateway control device and the media gateway device, same voice and video codecs in the session initiation
protocol/session description protocol out-of-band negotiation for the Internet protocol multimedia subsystem or in the H.245 inband negotiation for the circuit-switched network, respectively.

14. The method as claimed in claim 13 , further comprising exchanging information referring to the codecs supported between the media gateway device and the media gateway control device.

15. The method as claimed in claim 14 , wherein said sending of at least one of the terminal capability set messages by the media gateway control device includes instructions for the media gateway device as to the codecs that the media gateway device should specify.

16. The method as claimed in claim 14 , further comprising: receiving the codecs in the session initiation protocol/session description protocol signaling on the Internet protocol multimedia subsystem; and
sending the codecs from the media gateway control device to a media gateway control function.

17. The method as claimed in claim 14 , further comprising: selecting, by the media gateway device, supported codecs among the codecs received
from the media gateway control device that are supported by the media gateway device, and
sending the supported codecs in at least one of the terminal capability set messages.

18. The method as claimed in claim 17 , further comprising specifying, by the media gateway control device, the codecs in an add or modify message as parameters of a signal that instructs the media gateway device to implement the H.245

Assignees

• Belling Thomas
• Hanisch Hans-Jürgen
• Kalleitner Franz
• Seitter Norbert
• Trapp Andreas
• Siemens Ag

Inventors

• Belling Thomas
• Hanisch Hans-Jürgen
• Kalleitner Franz
• Seitter Norbert
• Trapp Andreas

Classifications

• H04L65/1069

  Session establishment or de-establishment · CPC title

• H04L65/1006

  Electricity · mapped topic

• H04L29/06176

  Electricity · mapped topic

• H04L29/06027 Primary

  Electricity · mapped topic

• H04L65/1046

  Call controllers; Call servers · CPC title