US 8,619,547 B2Granted

Communication system with failover communication services

AssigneeAT&T Intellectual Property I, L.P.

InventorsChaoxin Qiu, Arshad Khan, Niral Sheth

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Abstract

A system may include, for example, an Interrogating Call Session Control Function (I-CSCF) device having a processor adapted to receive a request from a Serving CSCF (S-CSCF) device communicatively coupled to a first communication device to establish communications with a second communication device responsive to the first communication device initiating a call directed to the second communication device, and to identify a primary S-CSCF device to which the second communication device is registered. The processor can also be adapted to detect a communication fault when attempting to communicate with the primary S-CSCF device, and to identify a secondary S-CSCF device that provides backup communication services to the second communication device responsive to detecting the communication fault. Other embodiments are disclosed.

Claims25

Dependent claims

A primary serving call session control function device comprising:

a memory to store instructions, and
a processor coupled to the memory,
wherein the primary serving call session control function device is communicatively coupled to a primary application server,
wherein the primary serving call session control function device and the primary application server operate collectively as a primary communication resource available to a communication device communicatively coupled to an internet protocol multimedia subsystem network, and
wherein the processor, responsive to executing the instructions, performs operations comprising:
receiving a registration request originated by the communication device;
obtaining a subscription profile associated with the communication device;
transmitting a registration message destined for the primary application server according to the subscription profile;
identifying a secondary serving call session control function device communicatively coupled to a secondary application server;
and
transmitting registration information associated with the communication device to the secondary serving call session control function device,
wherein the secondary serving call session control function device and the secondary application server operate collectively as a secondary communication resource available to the communication device to complete a call when a subsequent communication fault causes the primary communication resource to be unavailable, the secondary communication resource being available to the communication device prior to and separate from detection of the communication fault, wherein registration of the communication device with the secondary serving call session control function device is completed prior to detection of the communication fault.

9 more elements

A proxy call session control function device, comprising:

a memory to store instructions;
and
a processor coupled to the memory, wherein responsive to executing the instructions, the processor performs operations comprising:
receiving a registration request from a communication device;
transmitting the registration request to a primary serving call session control function device communicatively coupled to a primary application server, wherein the primary serving call session control function device and the primary application server operate collectively as a primary communication resource for the communication device;
and
receiving information regarding a secondary serving call session control function device communicatively coupled to a secondary application server;
subsequently detecting a communication fault in the primary communication resource;
and
establishing communication services with a secondary communication resource responsive to the detected communication fault,
wherein the secondary serving call session control function device and the secondary application server operate collectively as the secondary communication resource for providing backup communication services, the secondary communication resource being available to provide the backup communication services prior to and separate from detection of the communication fault, wherein the secondary communication resource provides the backup communication services without an additional registration process.

8 more elements

A backup serving call session control function device communicatively coupled to a backup application server, wherein the backup serving call session control function device and the backup application server operate collectively as a backup communication resource available to a communication device communicatively coupled to an internet protocol multimedia subsystem network, the backup serving call session control function device comprising:

a memory to store instructions;
and
a processor coupled to the memory, wherein responsive to executing the instructions, the processor performs operations comprising:
receiving registration information associated with the communication device, where the communication device is registered with a primary communication resource;
and
transmitting a registration message to the backup application server to enable backup services for the communication device,
wherein the operations are performed in a registration procedure for the communication device so that the backup communication resource is available in response to a subsequent detection of a communication fault,
wherein the backup serving call session control function device is available to provide the backup services prior to and separate from detection of the communication fault,
wherein the backup serving call session control function device provides the backup services without an additional registration procedure.

6 more elements

Dependencies are inferred from the claim text.