Handling redirect calls

• US 20080084986A1
• Filed: 10/10/2006
• Published: 04/10/2008
• Est. Priority Date: 10/10/2006
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Kohli, Sandeep Singh, Kumarasamy, Parameswaran, Parameswaran, Kavithadevi, Pande, Vinay
• Granted Patent: US 8,571,198 B2
• Time in Patent Office: Days
• US Class Current: 379/211.02
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04M 3/53 Centralised arrangements for recording incoming messages , i.e. mailbox systems
• CPC Class Codes: H04M 3/54 Arrangements for diverting calls for one subscriber to another predetermined subscriber based on the calling party profile H04M3/42059; based on location H04M3/42348; based on presence H04M3/42365; to voice mail H04M3/53308
• 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

Abstract

In a particular embodiment, a network device receives, from a first device, a first call request for a second device. The network device may then send the first call request to a redirect server, which can determine where to send the call. The network device receives a response from the redirect server indicating an address to redirect the call request to. The network device then determines a redirect ID for the redirect. The network device sends a message to the first device with the redirect ID where the message indicates that a redirection occurred to the third device. The network device then receives a second call request from the first device that includes the redirect ID. The network device determines if the call was part of a previous redirect. If so, the second call request is sent to the address associated with the redirect ID.

Claims

1. A method comprising:

receiving, from a first device at a network device, a first call request for a second device;

sending the first call request to a redirect server;

receiving a redirection response from the redirect server indicating a redirection from the second device to a third device, the redirection response comprising a third device address for the third device;

sending a message to the first device, the message indicating a redirection occurred and comprising a respond-to address for the network device;

receiving a second call request from the first device at the network device, the second call request being addressed to the respond-to address for the network device;

determining if the second call request is for the redirection to the third device even though the second call request is addressed to the respond-to address for the network device; and

sending the second call request to the third device using the third device address without sending the second call request through the redirect server if the second call request is for the redirection.

2. The method of claim 1, further comprising:

storing redirection information for the redirection, the redirection information being different from the third device address and being included in the message to the first device, wherein the second call request comprises the redirection information,

wherein determining that the second call request is for the redirection to the third device comprises determining that the second call request is for the redirection to the third device if the redirection information is included in the second call request.

3. The method of claim 2, further comprising storing the redirection information.

4. The method of claim 3, further comprising deleting the stored redirection information after receiving the second call request such that subsequent call requests using the using the redirection information are not sent to the third device without being sent to the redirect server.

5. The method of claim 2, further comprising dynamically determining the redirection information.

6. The method of claim 2, wherein the redirection information is unique to the first call request.

7. The method of claim 1, wherein the redirection response is a SIP 302 message.

8. The method of claim 1, wherein the third device address for the third device is not included in the message sent to the first device.

9. The method of claim 1, wherein the network device is configured to send the second call request to the redirection server if the second call request is not for the redirection.

10. An apparatus comprising:

one or more processors; and

logic encoded in one or more tangible media for execution by the one or more processors and when executed operable to;

receive, from a first device at a network device, a first call request for a second device;

send the first call request to a redirect server;

receive a redirection response from the redirect server indicating a redirection from the second device to a third device, the redirection response comprising a third device address for the third device;

send a message to the first device, the message indicating a redirection occurred and comprising a respond-to address for the network device;

receive a second call request from the first device at the network device, the second call request being addressed to the respond-to address for the network device;

determine if the second call request is for the redirection to the third device even though the second call request is addressed to the respond-to address for the network device; and

send the second call request to the third device using the third device address without sending the second call request through the redirect server if the second call request is for the redirection.

11. The apparatus of claim 10, wherein the logic when executed is further operable to:

store redirection information for the redirection, the redirection information being different from the third device address and being included in the message to the first device, wherein the second call request comprises the redirection information,

wherein the logic when executed is operable to determine that the second call request is for the redirection to the third device if the redirection information is included in the second call request.

12. The apparatus of claim 11, wherein the logic when executed is further operable to store the redirection information.

13. The apparatus of claim 12, the logic when executed is further operable to delete the stored redirection information after receiving the second call request such that subsequent call requests using the using the redirection information are not sent to the third device without being sent to the redirect server.

14. The apparatus of claim 11, the logic when executed is further operable to dynamically determine the redirection information.

15. The apparatus of claim 11, wherein the redirection information is unique to the first call request.

16. The apparatus of claim 10, wherein the redirection response is a SIP 302 message.

17. The apparatus of claim 10, wherein the third device address for the third device is not included in the message sent to the first device.

18. The apparatus of claim 10, wherein the network device is configured to send the second call request to the redirection server if the second call request is not for the redirection.

19. An apparatus comprising:

means for receiving, from a first device at a network device, a first call request for a second device;

means for sending the first call request to a redirect server;

means for receiving a redirection response from the redirect server indicating a redirection from the second device to a third device, the redirection response comprising a third device address for the third device;

means for sending a message to the first device, the message indicating a redirection occurred and comprising a respond-to address for the network device;

means for receiving a second call request from the first device at the network device, the second call request being addressed to the respond-to address for the network device;

means for determining if the second call request is for the redirection to the third device even though the second call request is addressed to the respond-to address for the network device; and

means for sending the second call request to the third device using the third device address without sending the second call request through the redirect server if the second call request is for the redirection.

20. The apparatus of claim 19, further comprising:

means for storing redirection information for the redirection, the redirection information being different from the third device address and being included in the message to the first device, wherein the second call request comprises the redirection information,

wherein the means for determining that the second call request is for the redirection to the third device comprises means for determining that the second call request is for the redirection to the third device if the redirection information is included in the second call request.