Intelligent provisioning of DSP channels for codec changes

• US 8,045,480 B2
• Filed: 03/18/2008
• Issued: 10/25/2011
• Est. Priority Date: 12/02/2004
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Krishnamoorthy, Balaji, Ganesamoorthi, Sai Suresh
• Primary Examiner(s): VU, THONG H
• Application Number:
  US12/050,770
• Publication Number:
  US 20080159524A1
• Time in Patent Office: 1,316 Days
• Field of Search: 370/477, 370/236, 455/557, 455/422
• US Class Current: 370/252
• CPC Class Codes: H04L 65/1089 by adding media; by removing media
• CPC Class Codes: H04L 69/24 Negotiation of communication capabilities
• CPC Class Codes: H04M 7/0072 Speech codec negotiation H04L65/1069 takes precedence

Abstract

A communication system in which a profile of codecs is loaded at the originating end. The originating end sends the profile of codecs to the terminating end and receives in return an indication of which codec to use. The originating end and the terminating end create a reduced profile that includes the codec identified by the terminating side and its peers. The peers are codecs that use the same amount of resources as the selected codec or that use less resources than the selected codec. Even though the reduced profile includes more than one codec, packets are coded and decoded using only the codec identified by a bit map that is available to the DSP channel at both the originating end and the terminating end. At a later time a change can be made to a different codec in the reduced profile by changing the bitmap and without closing and re-opening the channel.

Claims

1. A method of specifying codecs for use in processing a call at the originating end of said call, said method including the steps of:

selecting a profile of codecs to use in handling said call,

transmitting said profile to another unit handling said call,

receiving a selection of a codec that is selected from said profile of codecs,

creating a reduced profile that includes the selected codec and all its peer codecs, and

utilizing a codec is said reduced profile to process said call.

2. The method in claim 1 wherein said reduced profile of codecs includes a plurality of codecs that use the same amount or less resources than said selected codec.

3. The method recited in claim 1 wherein said method includes receiving a bit map which identifies said selected codec in said profile of codecs.

4. The method recited in claim 1 wherein said peer codecs are codecs that use the same amount or less resources than said selected codec.

5. The method recited in claim 1 wherein said peer codecs are the codecs in said profile of codecs that use the same amount or less resources than a selected codec, and said selected codec and said peer codecs form said reduced-profile of codecs.

6. The method recited in claim 1 wherein said system can change from said selected codec to another codec in said reduced-profile without closing and re-opening said channel.

7. The method in claim 1 wherein said call is transmitted by said originating end utilizing Internet Protocol packets.

8. The method in claim 7 wherein packets transmitted contain an Asynchronous Transfer Mode (ATM) coded telephone call, and said profile and said reduced profiles are respectively an Asynchronous Transfer Mode Adaptation Layer 2 (AAL2) profile and an AAL2 reduced profile.

9. The method of claim 1 wherein the receiving end of said call receives a profile of codecs to use in handling said call from said originating end of said call,

selects of a codec from said profile of codecs,

transmits an identification of said selected codec to said originating end, and

utilizes said selected codec to process said call.

10. An Apparatus that specifies codecs for use in processing a call at the originating end of said call, said apparatus including:

means for selecting a profile of codecs to use in handling said call,

means for transmitting said profile to another unit handling said call,

means for receiving a selection of a codec that is selected from said profile of codecs,

and

means for creating a reduced profile that includes the selected codec and all peer codecs of said selected codec, and

means for utilizing a codec in said reduced profile to process said call.

11. The apparatus in claim 10 wherein said reduced profiles of codecs include a plurality of codecs that use the same amount or less resources than said selected codec.

12. The apparatus recited in claim 10 wherein said apparatus includes means to receive a bit map which identifies said selected codec in said profile of codecs.

13. The apparatus recited in claim 10 wherein said means for creating a reduced profile creates a reduced profile that includes said selected codec and peer codecs that use the same amount or less resources than said selected codec.

14. The apparatus recited in claim 10 wherein said peer codecs are the codecs in said profile of codecs that use the same amount or fewer resources than said selected codec, and said selected codec and said peer codecs form said reduced-profile of codecs.

15. The apparatus in claim 10 wherein said profile and said reduced profiles are respectively an Asynchronous Transfer Mode Adaptation Layer 2 (AAL2) profile and an AAL2 reduced profile.

16. A method of specifying a codec for use in processing a call at the receiving end of said call, said method including the steps of:

receiving a profile of codecs to use in handling said call,

selecting of a codec from said profile of codecs,

transmitting an identification of said selected codec, and

utilizing said selected codec to process said call.

17. The method recited in claim 16 including receiving a reduced profile of codecs.

18. The method of claim 17 wherein said reduced profile of codecs includes codecs in said profile of codecs that use the same amount or fewer resources than said selected codec.

19. The method of claim 17 where said profile is an Asynchronous Transfer Mode Adaptation Layer 2 (AAL2) profile.

20. The method of claim 17 wherein said reduced profiles is an Asynchronous Transfer Mode Adaptation Layer 2 reduced profile.