Data communication apparatus and method

• US 8,254,372 B2
• Filed: 02/23/2004
• Issued: 08/28/2012
• Est. Priority Date: 02/21/2003
• Status: Active Grant

• Current Assignee: Genband US LLC (Ribbon Communications, Inc.)
• Original Assignee: Genband US LLC (Ribbon Communications, Inc.)
• Inventors: Rabipour, Rafi, Chu, Chung Cheung
• Primary Examiner(s): Nawaz, Asad M
• Assistant Examiner(s): Chu, Wutchung
• Application Number:
  US10/782,754
• Publication Number:
  US 20040252681A1
• Time in Patent Office: 3,109 Days
• Field of Search: 370352-356, 370/401, 37039531-39532, 370465-467, 370/252, 379 9308- 9309, 379/93.15, 379 9332- 9334, 379/142.14, 704/221, 704/275, 455/552.1, 709/247, 709227-228, 709230-232, 709220-221, 715249-250
• US Class Current: 370/352
• CPC Class Codes: H04L 65/103 in the network
• CPC Class Codes: H04L 65/104 in the network
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/765 intermediate
• CPC Class Codes: H04L 69/14 Multichannel or multilink protocols
• CPC Class Codes: H04L 69/24 Negotiation of communication capabilities
• CPC Class Codes: H04L 69/40 for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection management of faults, events, alarms or notifications in data switching networks H04L41/06
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04W 88/181 Transcoding devices; Rate adaptation devices

Abstract

Communication apparatus having interfaces for exchanging data with first and second neighbors, a memory for storing codec information regarding the communication apparatus and a control entity operative to detect a message from the first neighbor, the first message being indicative of codec information regarding an originating entity. In response, the control entity assesses compatibility between the codec information regarding the originating entity and the codec information regarding the communication apparatus. If the assessment is positive, the control entity self-identifies the communication apparatus as a candidate for terminally supporting a subsequent codec-bypass negotiation with the originating entity. If the assessment is negative, the control entity self-identifies the communication apparatus as a candidate for non-terminally supporting such negotiation. The invention thus capitalizes on the realization that although an end-to-end codec-bypass connection may not be possible, it may nevertheless be possible to achieve bandwidth savings by establishing a codec-bypass connection along only a portion of the path.

Claims

1. A communication apparatus, comprising:

a first interface for exchanging data with a first neighboring entity;

a second interface for exchanging data with a second neighboring entity;

a memory for storing codec information regarding said communication apparatus;

a control entity for detecting, after a call is established, a first message from the first neighboring entity via the first interface, the first message being indicative of codec information regarding an originating entity of the first message;

the control entity being configured to, responsive to detection at the first message, perform an assessment of compatibility between the codec information regarding the originating entity of the first message and the codec information regarding said communication apparatus;

the control entity being configured to, responsive to the assessment of compatibility being positive, self-identify the communication apparatus as a candidate for terminally supporting a subsequent codec-bypass negotiation with the originating entity of the first message, wherein terminally supporting the subsequent codec-bypass negotiation with the originating entity of the first message includes transcoding subsequent messages received from the originating entity of the first message according to the codec information regarding the originating entity of the first message and forwarding the transcoded messages to an intermediate entity configured to further forward the transcoded messages toward their destination; and

the control entity being configured to, responsive to the assessment of compatibility being negative, self-identify the communication apparatus as a candidate for non-terminally supporting a subsequent codec-bypass negotiation with the originating entity of the first message.

2. The communication apparatus defined in claim 1, further configured to, responsive to the assessment of compatibility being positive, release a second message towards the first neighboring entity via the first interface, the second message being indicative of the communication apparatus being self-identified as a candidate for terminally supporting a subsequent codec-bypass negotiation with the originating entity of the first message.

3. The communication apparatus defined in claim 1, further configured to, responsive to absence of any message from the second entity indicative of the second entity being self-identified as a candidate for terminally supporting subsequent codec-bypass negotiation with the originating entity of the first message, effect said subsequent codec-bypass negotiation with the first entity.

4. The communication apparatus defined in claim 1, wherein the control entity is configured to forward the first message to the second remote entity via the second interface.

5. The communication apparatus defined to claim 1, wherein the first and second interfaces are packet interfaces.

6. The communication apparatus defined in claim 1, wherein the first interface is a packet interface and the second interface is a circuit-switched interface.

7. The communication apparatus defined in claim 1, therein the first and second interfaces are circuit-switched interfaces.

8. The communication apparatus defined in claim 1, the control entity being further configured to:

detect a second message received from the second neighboring entity, the second message being indicative of the second neighboring entity apparatus being self-identified as a candidate for terminally supporting subsequent codec-bypass negotiation with the originating entity of the first message; and

responsive to detection of the second message, self-identify the communication apparatus as a candidate for non-terminally supporting a subsequent codec-bypass negotiation with the originating entity of the first message.

9. The communication apparatus defined in claim 8, wherein the control entity is configured to forward the second message to the first remote entity via the first interface.

10. The communication apparatus defined in claim 8, wherein the control entity is configured to monitor messages exchanged via the first and second interfaces that are indicative of negotiation of a codec-bypass connection between the originating entity of the first message and an entity different from the originating entity of the first message.

11. The communication apparatus defined in claim 10, said negotiation being a first negotiation, wherein the control entity is further configured to:

detect success or failure of said first negotiation; and

responsive to failure of said first negotiation, and if the communication apparatus is self-identified as a candidate for terminally supporting a subsequent codec-bypass negotiation with the originating entity of the first message, negotiate with the originating entity of the first message a codec-bypass connection between the communication apparatus and the originating entity of the first message.

12. The communication apparatus defined in claim 11, wherein the control entity is configured to, responsive to success of said first negotiation, and if the communication apparatus is self-identified as a candidate for terminally supporting a subsequent codec-bypass negotiation with the originating entity of the first message, self-identify the communication apparatus as a candidate for non-terminally supporting a codec-bypass negotiation with the originating entity of the first message.

13. The communication apparatus defined in claim 10, said negotiation being a first negotiation, wherein the control entity is further configured to:

detect success or failure of said first negotiation; and

responsive to success of said first negotiation, and if the communication apparatus is self-identified as a candidate for terminally supporting a subsequent codec-bypass negotiation with the originating entity of the first message, self-identify the communication apparatus as a candidate for non-terminally supporting a codec-bypass negotiation with the originating entity of the first message.

14. The communication apparatus defined in claim 11, wherein the originating entity of the first message is a endpoint gateway.

15. The communication apparatus defined in claim 11, wherein the originating entity of the first message is an in-path gateways.

16. A method of establishing candidacy of a gateway as terminally or non-terminally supporting a codec-bypass negotiation with an originating entity in a communications network, the method comprising:

after a call is established;

detecting a first message received from a first neighboring entity, the first message being indicative of codec information regarding the originating entity of the first message;

assessing compatibility between the codec information regarding the originating entity of the first message and the codec information regarding the gateway;

responsive to the assessment of compatibility being positive, self-identifying the gateway as a candidate for terminally supporting a subsequent codec-bypass negotiation with the originating entity of the first message, wherein terminally supporting the subsequent codec-bypass negotiation with the originating entity of the first message includes transcoding subsequent messages received from the originating entity of the first message according to the codec information regarding the originating entity of the first message and forwarding the transcoded messages to an intermediate entity configured to further forward the transcoded messages toward their destination; and

responsive to the assessment of compatibility being negative, self-identifying the gateway as a candidate for non-terminally supporting a subsequent codec-bypass negotiation with the originating entity the first message.

17. A non-transitory computer-readable media tangibly embodying a program of instructions executable by a computer to perform a method of establishing candidacy of a gateway as terminally or non-terminally supporting a codec-bypass negotiation with an originating entity in a communications network, the method comprising:

after a call is established;

detecting a first message received from a first neighboring entity, the first message being indicative of codec information regarding the originating entity of the first message;

assessing compatibility between the codec information regarding the originating entity of the first message and the codec information regarding the gateway;

responsive to the assessment of compatibility being positive, self-identifying the gateway as a candidate for terminally supporting a subsequent codec-bypass negotiation with the originating entity of the first message wherein terminally supporting the subsequent codec-bypass negotiation with the originating entity of the first message includes transcoding subsequent messages received from the originating entity of the first message according to the codec information regarding the originating entity of the first message and forwarding the transcoded messages to an intermediate entity configured to further forward the transcoded messages toward their destination; and

responsive to the assessment of compatibility being negative, self-identifying the gateway as a candidate for non-terminally supporting a subsequent codec-bypass negotiation with the originating entity of the first message.