Method and arrangement for signalling in a wireless IP multimedia network and a wireless IP multimedia network terminal device

• US 20030108020A1
• Filed: 11/12/2002
• Published: 06/12/2003
• Est. Priority Date: 11/12/2001
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Garcia-Martin, Miguel-Angel
• Granted Patent: US 7,529,213 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04L 65/1016 IP multimedia subsystem [IMS]
• CPC Class Codes: H04L 65/1043 Gateway controllers, e.g. media gateway control protocol [MGCP] controllers
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04M 7/1295 Details of dual tone multiple frequency signalling
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 99/00 Subject matter not provided for in other groups of this subclass

Abstract

The present invention relates in general to telecommunication networks and more specifically to a method and an arrangement for signalling in a wireless IP multimedia network and to a wireless IP multimedia network terminal device. With the help of the solution according to the presented invention 3GPP Core Network IP Multimedia Subsystem and all the products associated with that i.e. terminals, Media Gateway, Media Gateway Control Function, etc. can to support DTMF tones.

Claims

1. A method for signalling in a wireless IP multimedia network, wherein the method comprises the steps of

triggering (15) a SIP re-INVITE message that is received by the remote endpoint,

establishing (16) a new media stream for sending Representations of the DTMF digits in RTP packets between the two endpoints using error protected PDP context,

transferring (17) a representation of the DTMF digit corresponding each keystroke pressed by the user over the said error protected PDP context.

2. A method according to claim 1, wherein prior to sending any actual representations of the DTMF digits, the user presses a key in a terminal to instruct the terminal the need to send DTMF tones.

3. A method according to claim 2, wherein after a key in the terminal is pressed a SIP re-INVITE message to be received by the remote endpoint is triggered (15), said SIP re-INVITE message containing a new session description adding a new audio media stream, said new audio media stream including support for the RTP payload for DTMF digits.

4. A method according to claim 3, wherein an additional, strongly error protected PDP context is established for the added new media stream for sending representations of the DTMF digits in RTP packets between the two endpoints.

5. A method according to claim 3, wherein an existing PDP context is used for the added new media stream for sending representations of the DTMF digits in RTP packets between the two endpoints.

6. A method according to claim 1, wherein when the DTMF interaction is finished, the method also comprises a step of

triggering (18) a new SIP re-INVITE message that removes or sets to inactive the additional media stream previously published to be used for the DTMF digits.

7. A method according to claim 6, wherein triggering (18) a new SIP re-INVITE message in response to the user pressing a pre-determined key in a terminal.

8. A method according to claim 1, wherein a mechanism is automatically set up so that when any DTMF key is pressed in the middle of the call, it is interpreted as an initiation of the DTMF service and as a first character of the DTMF service.

9. A method according to claim 1, wherein a terminal initiating or terminating call or session does not know, in advance, if sending or receiving DMTF digits is required or not.

10. A method according to claim 2, wherein a terminal initiating or terminating call or session does not know, in advance, if sending or receiving DMTF digits is required or not.

11. An arrangement for signalling in a wireless IP multimedia network, wherein the arrangement has means for sending representations of the pressed DMTF digits over the user plane through a separate, strongly protected PDP context.

12. An arrangement according to claim 11, wherein the arrangement sets up PDP context on demand to transport digits.

13. An arrangement for signalling in a wireless IP multimedia network, the wireless IP multimedia network having a terminal A (1) initiating a call to terminal B (4) through the wireless IP multimedia network (7), wherein in the arrangement has

means for triggering (15) a SIP re-INVITE message that is received by the remote endpoint,

means for establishing (16) a new media stream for sending representations of the DTMF digits in RTP packets between the two endpoints using error protected PDP context, and

means for transferring (17) a representation of the DTMF digit corresponding each keystroke pressed by the user over the said error protected PDP context.

14. An arrangement according to claim 13, wherein the arrangement has means for detecting the user pressing a key in a terminal A (1) prior to sending any actual representations of the DTMF digits said pressing a key instructing the terminal A (1) the need to send DTMF tones.

15. An arrangement according to claim 14, wherein after a key in the terminal is pressed a SIP re-INVITE message to be received by the remote endpoint is triggered (15), said SIP re-INVITE message containing a new session description adding a new audio media stream, said new audio media stream including support for the RTP payload for DTMF digits.

16. An arrangement according to claim 15, wherein an additional, strongly error protected PDP context is established for the added new media stream for sending representations of the DTMF digits in RTP packets between the two endpoints.

17. An arrangement according to claim 15, wherein an existing PDP context is used for the added new media stream for sending representations of the DTMF digits in RTP packets between the two endpoints.

18. An arrangement according to claim 15, wherein the arrangement has means to re-generate the DTMF tones from the received RTP data.

19. An arrangement according to claim 13, wherein the arrangement has means for triggering (18) a new SIP re-INVITE message when the DTMF interaction is finished, said new SIP re-INVITE message removing or setting to inactive the additional media stream previously published to be used for the representations of the DTMF digits.

20. An arrangement according to claim 19, wherein triggering (18) a new SIP re-INVITE message in response to the user pressing a pre-determined key in a terminal.

21. An arrangement according to claim 13, wherein a mechanism is automatically set up so that when any DTMF key is pressed in the middle of the call, it is interpreted as an initiation of the DTMF service and as a first character of the DTMF service.

22. An arrangement according to claim 13, wherein a terminal initiating or terminating call or session does not know, in advance, if sending or receiving DMTF digits is required or not.

23. An arrangement according to claim 14, wherein a terminal initiating or terminating call or session does not know, in advance, if sending or receiving DMTF digits is required or not.

24. A wireless IP multimedia network terminal device, wherein the terminal has means for sending a representation of the pressed DMTF digits are sent over the user plane as a separate, strongly protected PDP context.

25. A terminal device according to claim 24, wherein the terminal sets up PDP context on demand to transport digits.

26. A wireless IP multimedia network terminal device, the wireless IP multimedia network having said terminal device A (1) initiating a call to terminal B (4) through the wireless IP multimedia network (7), wherein in the said terminal device A (1) has

means for triggering (15) a SIP re-INVITE message that is received by the remote endpoint,

means for establishing (16) a new media stream for sending representations of the DTMF digits in RTP packets between the two endpoints using error protected PDP context, and

means for transferring (17) a representation of the DTMF digit corresponding each keystroke pressed by the user over the said error protected PDP context.

27. A terminal device according to claim 26, wherein the arrangement has means for detecting the user pressing a key in a terminal A (1) prior to sending any actual representations of the DTMF digits said pressing a key instructing the terminal A (1) the need to send DTMF tones.

28. A terminal device according to claim 27, wherein after a key in the terminal is pressed a SIP re-INVITE message to be received by the remote endpoint is triggered (15), said SIP re-INVITE message containing a new session description adding a new audio media stream, said new audio media stream including support for the RTP payload for DTMF digits.

29. A terminal device according to claim 28, wherein an additional, strongly error protected PDP context is established for the added new media stream for sending representations of the DTMF digits in RTP packets between the two endpoints.

30. A terminal device according to claim 28, wherein an existing PDP context is used for the added new media stream for sending representations of the DTMF digits in RTP packets between the two endpoints.

31. A terminal device according to claim 26, wherein the arrangement has means for triggering (18) a new SIP re-INVITE message when the DTMF interaction is finished, said new SIP re-INVITE message removing or setting to inactive the additional media stream previously published to be used for the representations of the DTMF digits.

32. A terminal device according to claim 31, wherein triggering (18) a new SIP re-INVITE message in response to the user pressing a pre-determined key in a terminal.

33. A terminal device according to claim 26, wherein a mechanism is automatically set up so that when any DTMF key is pressed in the middle of the call, it is interpreted as an initiation of the DTMF service and as a first character of the DTMF service.

34. A terminal device according to claim 26, wherein a terminal initiating or terminating call or session does not know, in advance, if sending or receiving DMTF digits is required or not.

35. A terminal device according to claim 27, wherein a terminal initiating or terminating call or session does not know, in advance, if sending or receiving DMTF digits is required or not.

36. A network device installed in a wireless IP multimedia network, wherein the network device has means to receive RTP data and means to re-generate the DTMF tones from the received RTP data.