Bandwidth biased codec selection system and method

• US 6,373,839 B1
• Filed: 12/10/1999
• Issued: 04/16/2002
• Est. Priority Date: 12/10/1999
• Status: Expired due to Term

• Current Assignee: Enterprise Systems Technologies S.a.r.l. (Atos SE)
• Original Assignee: Siemens Information And Communication Networks, Inc. (Siemens AG)
• Inventors: Clark, Mark, Lo, Eddie
• Primary Examiner(s): Chin, Wellington
• Assistant Examiner(s): JONES, PRENELL P
• Application Number:
  US09/467,550
• Time in Patent Office: 858 Days
• Field of Search: 370/352, 370/260-267, 370/419, 522/401, 490/311, 263/216, 435/385, 435/465-468, 379/167.05, 379/229, 379/88-7-, 379/269, 455/462-466, 455/524, 455/557-567, 455/414-418, 455/403, 455/412, 455/458, 709/247, 709/227-228, 709/236
• US Class Current: 370/352
• CPC Class Codes: H04L 65/1043 Gateway controllers, e.g. media gateway control protocol [MGCP] controllers
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/1106 Call signalling protocols; H.323 and related
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04L 69/24 Negotiation of communication capabilities
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04M 7/006 Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer H04L65/00 takes precedence; aspects not specific to the type of network H04M3/00; special services in those networks H04M3/42
• CPC Class Codes: H04M 7/0072 Speech codec negotiation H04L65/1069 takes precedence
• CPC Class Codes: H04Q 2213/13034 A/D conversion, code compression/expansion
• CPC Class Codes: H04Q 2213/13106 Microprocessor, CPU
• CPC Class Codes: H04Q 2213/13196 Connection circuit/link/trunk/junction, bridge, router, gateway
• CPC Class Codes: H04Q 2213/13204 Protocols
• CPC Class Codes: H04Q 2213/1325 Priority service
• CPC Class Codes: H04Q 2213/1327 Release and resetting of connection
• CPC Class Codes: H04Q 2213/13299 Bus
• CPC Class Codes: H04Q 2213/13389 LAN, internet

Abstract

Endpoints, such as clients and gateways, maintain local codec priority lists (500), receive remote codes priority lists (504), and maintain common communication attribute priority lists (502). When opening a transmittal channel, a local endpoint determines the highest priority codec on its local priority list (500) that is also on the remote priority list (504). The local endpoint also determines the highest priority codec on the remote priority list (504) that is also on the local priority list (500). If the codes types match, then the transmitting channel is opened with that codec. If there is no match, then the common communication attribute priority list (502) is used, and the local or remote codec that has a corresponding highest or lowest desired attribute is used for the communication.

Claims

1. A telecommunications system, comprising:

a packet switched network;

one or more telephony endpoints coupled to said packet switched network, said one or more telephony endpoints configured to communicate using one or more coding algorithms;

wherein at least one of said telephony endpoints includes a coding resources unit, said coding resources unit configured to maintain a local priority list, a remote priority list, and a common attribute list for selecting a codec for transmission.

2. A telecommunications system in accordance with claim 1, wherein said packet switched network is H.323 compatible.

3. A telecommunications system in accordance with claim 2, wherein said coding resources unit is configured to identify a highest priority codec on said local priority list that is also on said remote priority list.

4. A telecommunications system in accordance with claim 3, wherein said coding resources unit is configured to identify a highest priority codec on said remote priority list that is also on said local priority list.

5. A telecommunications system in accordance with claim 4, wherein said coding resources unit is configured to determine if said highest priority codecs are the same.

6. A telecommunications system in accordance with claim 5, wherein said coding resources unit is configured to use a first listed of said highest priority codecs from said common attribute list if said highest priority codecs are not the same.

7. A telecommunications method, comprising:

receiving a remote priority list;

identifying a first highest priority codec on a local priority list that is also on said remote priority list;

identifying a second highest priority codec on said remote priority list that is also on said local priority list;

determining whether said first and second codecs are the same;

transmitting with said first and second codecs if said first and second codecs are the same; and

selecting one of said first and second codecs from a common attribute list if said first and second codecs are not the same.

8. A telecommunications method according to claim 7, wherein said common attribute list orders said codecs according to bandwidth usage.

9. A telecommunications method according to claim 7, wherein said common attribute list orders said codecs according to voice quality.

10. A telecommunications device, comprising:

a plurality of codecs, wherein said telecommunications device is adapted to communicate with other telecommunications devices using said plurality of codecs; and

a coding resources unit for selecting one of said plurality of codecs for communicating, said coding resources unit configured to maintain a local priority list, a remote priority list, and a common attribute list for selecting a codec for transmission.

11. A telecommunications device in accordance with claim 10, wherein said coding resources unit is configured to identify a highest priority codec on said local priority list that is also on said remote priority list.

12. A telecommunications device in accordance with claim 11, wherein said coding resources unit is configured to identify a highest priority codec on said remote priority list that is also on said local priority list.

13. A telecommunications device in accordance with claim 12, wherein said coding resources unit is configured to determine if said highest priority codecs are the same.

14. A telecommunications device in accordance with claim 13, wherein said coding resources unit is configured to use a first listed of said highest priority codecs from said common attribute list if said highest priority codecs are not the same.