Customer premises equipment call re-routing technique

• US 6,907,031 B1
• Filed: 02/26/2001
• Issued: 06/14/2005
• Est. Priority Date: 02/26/2001
• Status: Expired due to Term

• Current Assignee: AT&T Corporation (AT&T, Inc.)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Gilboy, Christopher P, Ehlinger, James, Fellingham, Paul J.
• Primary Examiner(s): Phan, Man U.
• Assistant Examiner(s): Nguyen, Toan
• Application Number:
  US09/793,641
• Time in Patent Office: 1,569 Days
• Field of Search: 370/352, 370/353, 370/354, 370/401, 370/395.52, 370/395.72, 379/221.01, 379/221.02, 379/221.09
• US Class Current: 370/352
• CPC Class Codes: H04L 45/22 Alternate routing
• CPC Class Codes: H04Q 2213/13034 A/D conversion, code compression/expansion
• CPC Class Codes: H04Q 2213/13141 Hunting for free outlet, circuit or channel
• CPC Class Codes: H04Q 2213/13145 Rerouting upon failure
• CPC Class Codes: H04Q 2213/13196 Connection circuit/link/trunk/junction, bridge, router, gateway
• CPC Class Codes: H04Q 2213/13282 Call forward, follow-me, call diversion
• CPC Class Codes: H04Q 2213/13389 LAN, internet
• CPC Class Codes: H04Q 3/66 Traffic distributors

Abstract

A call from a calling party (12) is routed to at least one called party (14, 16, and 18) in accordance with the network preference of the calling party while taking into account the network capability of the called party. The calling party initiates an attempt to the called party over a preferred network (32) by first querying a database (40) containing records, each indicating the network capability of a corresponding called party. If the called party has the capability of receiving a call on the preferred network, the call is routed over that network. Otherwise, the call is routed over an alternate network (30) on which the called party has the capability of receiving a call.

Claims

1. A method for routing a call from a calling a party to a called party in accordance with a network preference of the calling party while accounting for a network capability of the called party, comprising the steps of:

receiving in a first network preferred by the calling party a call attempt to reach the called party;

querying a database, containing records of called parties, each specifying a network capability of corresponding called party, to ascertain whether said called party has the capability of receiving the call through the preferred network, and if so;

routing the call over the preferred network, otherwise;

ascertaining whether a gateway exists between the preferred network and an alternate network over which the called party has the capability of receiving the call, and if so, routing the call through the gateway, otherwise;

sending a redirect message to the calling party to redirect the call entirely over the alternate network;

wherein the call is routed entirely over the alternate network if no response is received from the database within a prescribed interval.

2. The method according to claim 1 wherein the database is queried by receiving a telephone number associated with said called party.

3. The method according to claim 2 wherein said database is updated by a provider of telecommunications service.

4. The method according to claim 2 wherein said database is updated by the called party.

5. The method according to claim 2 wherein said database is updated by the called party CPE device.

6. The method according to claim 1 wherein the querying step includes the step of ascertaining whether the called party has the capability of receiving calls through both the preferred and alternate networks, and if so, then routing the call over the network having the least cost.

7. The method according to claim 1 wherein said preferred network is determined by using least cost routing criteria of the preferred and alternate networks.

8. A method for routing a call from a calling party to a called party over an IP network preferred by the calling party while accounting for a network capability of the called party, comprising the steps of:

receiving in the IP network a call attempt to reach the called party;

querying through the IP network a database, containing records of called parties, each specifying a network capability of corresponding called party, to ascertain whether said called party has the capability of receiving the call through the IP network, and if so;

routing the call over the IP network, otherwise;

ascertaining whether a gateway exists between the IP network and an alternate network over which the called party has the capability of receiving the call, and if so, routing the call through the gateway, otherwise;

sending a redirect message to the calling party to redirect the call entirely over the alternate network;

wherein the call is routed entirely over the PSTN if no response is received from the database within a prescribed interval.

9. The method according to claim 8 wherein the database is queried by receiving a telephone number associated with said called party.

10. The method according to claim 8 wherein said database is updated by a provider of telecommunications service.

11. The method according to claim 8 wherein said database is updated by the called party.

12. The method according to claim 8 wherein said database is updated by the called party CPE device.

13. The method according to claim 8 wherein the querying step includes the step of ascertaining whether the called party has the capability of receiving calls through both the IP network and the PSTN, and if so, then routing the call over the network having the least cost.

14. The method according to claim 8 wherein said preferred network is determined by using least cost routing criteria of the preferred and alternate networks.

15. A method for routing a call from a calling party to a called party in accordance with a least cost network preference of the calling party while accounting for a network capability of the called party, comprising the steps of:

receiving from the calling party in an originating network a call attempt to reach the called party;

querying a database, containing records of called parties, each record specifying a network capability of a corresponding called party, including cost information for routing a call on each network on which the called party can receive a call, to ascertain whether said called party has the capability of receiving the call through two or more networks, and if so;

routing the call over at least a portion of the network having a least cost, otherwise;

routing the call over at least a portion of an alternate network on which the called party can receive the call;

wherein the call is routed entirely over the alternate network if no response is received from the database within a prescribed interval.

16. The method according to claim 15 wherein the call to the called party is routed over the originating network to the least cost network when a gateway exists between the originating and least cost networks.

17. The method according to claim 15 wherein the call is routed entirely over the least cost network when no gateway exists between the originating and least cost networks.

18. The method according to claim 15 wherein the database is queried by receiving a telephone number associated with said called party.

19. The method according to claim 18 wherein said database is updated by a provider of telecommunications service.

20. The method according to claim 18 wherein said database is updated by the called party.

21. The method according to claim 18 wherein said database is updated by the called party CPE device.

22. The method according to claim 15 wherein the step of routing the call over at least a portion of an alternate network on which the called party can receive the call further comprises:

ascertaining whether a gateway exists between the originating network and the alternate network, and if so, routing the call through the gateway, otherwise;

sending a redirect message to the calling party to redirect the call entirely over the alternate network.