Call handling scheme to reduce roaming charges

• US 7,627,314 B2
• Filed: 06/14/2004
• Issued: 12/01/2009
• Est. Priority Date: 01/27/2004
• Status: Active Grant

• Current Assignee: AT&T Mobility II LLC (AT&T, Inc.)
• Original Assignee: AT&T Mobility II LLC (AT&T, Inc.)
• Inventors: Riffe, Scott E., Carlson, Steven I.
• Primary Examiner(s): Edouard; Patrick N
• Assistant Examiner(s): PHUONG, DAI
• Application Number:
  US10/867,957
• Publication Number:
  US 20050164702A1
• Time in Patent Office: 1,996 Days
• Field of Search: 455/432.1, 455/432.3, 455/433, 455/428
• US Class Current: 455/432.1
• CPC Class Codes: H04W 4/16 Communication-related supplementary services, e.g. call-transfer or call-hold
• CPC Class Codes: H04W 76/20 Manipulation of established connections

Abstract

A second switch receives an indication from a roaming network that a call forwarded by the roaming network has been dropped by the roaming network, and in response to receiving the indication, forwards the call from a first switch.

Claims

1. A method of forwarding a call while reducing roaming charges, the method comprising:

providing a roaming network with generic call forwarding information;

signaling the roaming network to drop calls forwarded in accordance with the generic call forwarding information;

receiving, at a second switch, an indication from the roaming network that a call forwarded by the roaming network has been dropped by the roaming network;

wherein the roaming network initiated a drop by forwarding the call to a generic number of a first switch through a Visitor Location Registry (VLR) of the roaming network, based upon the generic call forwarding information; and

in response to receiving the indication, forwarding the call from the first switch,

wherein the generic call forwarding information is predetermined without a particular subscriber'"'"'s preferences.

2. The method of claim 1, further comprising:

receiving the call at the first switch;

providing the call from the first switch to the roaming network;

receiving the call forwarded from the roaming network at the second switch;

the second switch signaling the roaming network to drop the call;

the first switch receiving the indication from the roaming network that the call has been dropped without being answered; and

the first switch forwarding the call.

3. The method of claim 1, further comprising:

receiving a query for call forwarding information for a roaming subscriber;

determining whether calls to the roaming subscriber should be forwarded according to the generic call forwarding information;

when calls to the roaming subscriber should be forwarded according to the generic call forwarding information, providing the generic call forwarding information in response to the query; and

otherwise providing in response to the query call forwarding information that is specific to the subscriber.

4. The method of claim 3, further comprising:

the call forwarding information comprising a routing number to the second switch.

5. The method of claim 3, further comprising:

the routing number the same for two or more of forward no answer, forward busy, and forward do-not-disturb.

6. A method of forwarding a call while reducing roaming charges, the method comprising:

a switch of a home network receiving a call; and

the switch signaling a roaming network to drop the call when the call has been routed from the roaming network according to a predetermined generic routing number provided to the roaming network by the home network, wherein the roaming network initiates a drop by forwarding the call to a generic number of another switch through a Visitor Location Registry (VLR) of the roaming network based upon the generic call forwarding information, the another switch forwarding the call to the switch in response to an indication that the roaming network has dropped the call, the generic routing number being part of generic call forwarding information predetermined without a particular subscriber'"'"'s preferences.

7. A method of forwarding a call while reducing roaming charges, the method comprising:

a switch of a home network providing a call to a roaming network;

the switch receiving an indication from the roaming network that the call was dropped through forwarding of the call from the roaming network to a generic number linked to another switch through a Visitor Location Registry (VLR) of the roaming network based upon the generic call forwarding information, the generic number provided to the roaming network from a home location register along with generic call forwarding information, the generic call forwarding information being predetermined without a particular subscriber'"'"'s preferences, the generic call forwarding information including a signal to the roaming network to drop calls forwarding in accordance with the generic call forwarding information, the another switch forwarding the call to the switch in response to the indication that the roaming network has dropped the call; and

when the call was dropped by the roaming network without being answered, the switch forwarding the call according to a called party'"'"'s call forwarding information.

8. The method of claim 7, further comprising:

the switch obtaining the called party'"'"'s call forwarding information from a subscriber record stored by a home location registry.

9. The method of claim 7, further comprising:

when the call was dropped by the roaming network after being answered, the switch dropping the call.

10. A switch for forwarding a call while reducing roaming charges, the method comprising:

a processor; and

logic that, when applied to the processor, results in the switch signaling a roaming network to drop a call when the call has been routed from the roaming network to the switch in accordance with a predetermined generic routing number provided to the roaming network in response to a request from the roaming network for conditional call forwarding information for a called party, wherein the roaming network initiates a drop by forwarding the call to a generic number of another switch through a Visitor Location Registry (VLR) of the roaming network based upon the generic call forwarding information, the another switch forwarding the call to the switch in response to an indication that the roaming network has dropped the call, the generic number provided to the roaming network from a home location register along with generic call forwarding information, the generic call forwarding information being predetermined without a particular subscriber'"'"'s preferences.

11. A switch for forwarding a call while reducing roaming charges, the method comprising:

a processor; and

logic that, when applied to the processor, results in the switch forwarding a call according to a called party'"'"'s call forwarding information, when the switch provided the call to a roaming network, and the switch receives an indication through a generic number that the call was dropped by the roaming network, and when the call was dropped by the roaming network without being answered, the logic including generic call forwarding information including a signal to the roaming network to drop calls forwarded in accordance with generic call forwarding information, wherein the roaming network initiated a Visitor Location Registry (VLR) of the roaming network based upon the generic call forwarding information, the another switch forwarding the call to the switch in response to the indication that the roaming network has dropped the call, wherein the generic number is provided to the roaming network from a home location register along with generic call forwarding information, the generic call forwarding information being predetermined without a particular subscriber'"'"'s preferences.

12. The switch of claim 11, further comprising:

logic that, when applied to the processor, results in the switch dropping the call after receiving an indication that the call was dropped after being answered.