Abstract: According to one method for preserving stable calls during failover, during a dialog between two user endpoints, a determination is made whether a standby call processor has become operational, such as when a corresponding primary call processor is in fault. Responsive to determining that the standby call processor has become operational, a signaling protocol message is received from a requester. A determination is made whether the message includes an in-dialog signaling protocol request. Responsive to determining that the message includes the in-dialog request, a determination is made whether a call state associated with the dialog is found in memory. Responsive to determining that the call state associated with the dialog is not found in memory, a non-call terminating error response is made responding to the in-dialog request. The non-call terminating error response may cause the requester to terminate the in-dialog request but not terminate the dialog.

Abstract: A system that incorporates teachings of the subject disclosure may include, for example, a home subscriber server having a memory coupled to a processor. The processor can be configured to store a first identity of a first communication device registered with a primary communication resource and a secondary communication resource, receive a request associated with a registration request initiated by a second communication device, detect that a second identity of the second communication device matches the first identity of the first communication device, and direct a registration of the second communication device with at least one of the primary communication resource or the secondary communication resource responsive to the detected match. Other embodiments are disclosed.

Abstract: A system that incorporates teachings of the present disclosure may include, for example, a Domain Name System (DNS) server having a controller to receive new provisioning information for updating a Fully Qualified Domain Name (FQDN), and update the FQDN with the new provisioning information. The new provisioning information can include among other things a start time for rehoming one or more user endpoint devices (UEs) assigned to a current session border Controller (S/BC), a move-from record comprising a descriptor of at least the current S/BC, a move-to record comprising a descriptor of at least a new S/BC to which to rehome the one or more UEs, a transfer window representing a total time for the rehoming the one or more UEs to the new S/BC, and a pacing parameter for rehoming the one or more UEs to the new S/BC during the transfer window. Additional embodiments are disclosed.

Abstract: A method and system for growing a next generation network (NGN) using a modular design are disclosed. For example, the method defines a growth core module to support a specific number of subscribers, wherein the growth core module is assigned a module identifier (ID). The method upgrades existing network entities that will be impacted by an installation of the growth core module in the existing IMS network, and installs the growth core module in the IMS network.

Abstract: A mechanism controls global synchronization, or registration floods, that may result when a large number of endpoints in a Voice over Internet Protocol (VoIP) network such as an Internet Protocol Multimedia Subsystem (IMS) come online simultaneously after a catastrophic failure. The mechanism allows the Domain Name System (DNS) infrastructure to efficiently control the overload condition by registering user end points with backup border elements, and by staggering and by randomizing the time-to-live (TTL) parameter in registrations with backup border elements.

Abstract: A method includes receiving a message at a server. The message indicates that a network is unable to fulfill a request for media content for a user device. The method may also include sending, from the server to the user device, an offer to inform the user device when the network is able to fulfill the request.

Abstract: A method that incorporates teachings of the present disclosure may include, for example, receiving an assignment to provide communication services to a communication device, supplying a first telephone number mapping system of a first internet protocol multimedia subsystem communication system with contact information of the communication device and a serving call session control function operating in the first internet protocol multimedia subsystem communication system, supplying a second telephone number mapping system of a second internet protocol multimedia subsystem communication system with contact information of the communication device and the serving call session control function, and receiving a session initiation protocol INVITE from an originating serving call session control function of the second internet protocol multimedia subsystem communication system for establishing communications with the communication device. Additional embodiments are disclosed.

Abstract: In a particular embodiment a system and method for processing a call in a Voice over internet protocol (VoIP) network are disclosed. The method includes receiving the call associated with a private identifier (PRID) at a server, classifying a call location based on the PRID and sending the call from the server to a Public Safety Answering Point (PSAP) with a call back number associated with the PRID. The system includes a first server interface for receiving a message containing a PRID associated with the call, a second server interface to access the data base for searching for the PRID in the data structure; a third server interface to receive an output from the database indicating whether a PRID has been found in the data structure; and a fourth server interface to send the call to a PSAP.

Abstract: A system and method of sending subject line messages is provided. A particular method includes receiving a call setup signaling message. The call setup signaling message includes a message identifier. The method further includes determining a subject line message associated with the message identifier of the call setup signaling message. The message identifier is replaced with the subject line message. The method further includes transmitting the call setup signaling message to a called party.

Abstract: A method and system for growing a next generation network (NGN) using a modular design are disclosed. For example, the method defines a growth core module to support a specific number of subscribers, wherein the growth core module is assigned a module identifier (ID). The method upgrades existing network entities that will be impacted by an installation of the growth core module in the existing IMS network, and installs the growth core module in the IMS network.

Abstract: A system that incorporates teachings of the present disclosure may include, for example, an edge device having a controller to receive a Session Initiation Protocol (SIP) message from a user endpoint device (UE) requesting communication services, forward the SIP message to a network element of a Server Office, receive from the network element a first error message indicating communication services at the Server Office are unavailable, replace the first error message with a second error message, the second error message indicating a temporary unavailability of communication services, and transmit the second error message to the UE. Additional embodiments are disclosed.

Abstract: A system that incorporates teachings of the present disclosure may include, for example, a Telephone Number Mapping system operating in a first IP Multimedia Subsystem (IMS) communication system having a controller adapted to receive first contact information of a communication device registered through a terminating Serving Call Session Control Function (S-CSCF) operating in a second IMS communication system and second contact information of at least one among an Interrogating CSCF (I-CSCF) of the second IMS communication system and the terminating S-CSCF. Additional embodiments are disclosed.

Abstract: Methods, systems, and computer-readable media for reporting an availability status of resources associated with a server in a network in a network are described. According to one aspect, a computer-implemented method of reporting an availability status of resources associated with a server in a network includes determining the availability status of resources associated with the server. The availability status of resources is then inserted into a resource availability status header of a message. The message including the availability status of resources associated with the server is then sent.

Abstract: Methods and apparatus to perform quality testing in Internet Protocol (IP) Multimedia subsystem (IMS) based communication systems are disclosed. An example IMS-based system comprises a web portal to allow a user to configure quality testing for a user endpoint and to present results of the quality testing, a test server to exchange packets with the user endpoint to perform the testing, an IMS application server to implement a state machine to establish a test session between the test server and a test module of the user endpoint, the packets to be exchanged between the test server and the test module via the session, and a data analyzer to determine one or more parameters representative of performance of the session based on the exchanged packets, and to provide the same to the web portal, the web portal to present information representative of the one or more parameters to the user.

Abstract: A system that incorporates teachings of the present disclosure may include, for example, an edge device having a controller to receive a Session Initiation Protocol (SIP) message from a user endpoint device (UE) requesting communication services, forward the SIP message to a network element of a Server Office, receive from the network element a first error message indicating communication services at the Server Office are unavailable, replace the first error message with a second error message, the second error message indicating a temporary unavailability of communication services, and transmit the second error message to the UE. Additional embodiments are disclosed.

Abstract: Methods, systems, and computer-readable media for ensuring data integrity during data synchronization are provided. According to one method, a number of originating requests from a plurality of user endpoints are monitored across a network. A determination is made whether the number of originating requests is below a first threshold. Responsive to determining that the number of originating requests is below the first threshold, probe messages are transmitted to at least a portion of the plurality of user endpoints across the network. A number of the user endpoints that return probe replies in response to the probe messages are monitored. A determination is made whether the number of the user endpoints is below a second threshold. Responsive to determining that the number of the user endpoints is below the second threshold, a report is made to a database that the network is unavailable, thereby causing the database to stop updating time stamps.

Abstract: A system for improving operations in an Internet Protocol Multimedia Subsystem (IMS) network is provided. A system that incorporates teachings of the present disclosure may include, for example, a Telephone Number Mapping (ENUM) system having a controller element to receive from a terminating Serving Call Session Control Function (S-CSCF) first contact information for a communication device and second contact information for the terminating S-CSCF. Additional embodiments are disclosed.

Abstract: A system that incorporates teachings of the present disclosure may include, for example, a method for receiving initial filter criteria from a home subscriber server, transmitting information obtained from the initial filter criteria to a domain name system, receiving a multicast IP address from the domain name system, and transmitting a message to a plurality of IP multimedia subsystem network elements according to the multicast IP address. The message can be used for configuring the plurality of IP multimedia subsystem network elements. Other embodiments are disclosed.

Abstract: In a particular embodiment a system and method for processing a call in a Voice over internet protocol (VoIP) network are disclosed. The method includes receiving the call associated with a private identifier (PRID) at a server, classifying a call location based on the PRID and sending the call from the server to a Public Safety Answering Point (PSAP) with a call back number associated with the PRID. The system includes a first server interface for receiving a message containing a PRID associated with the call, a second server interface to access the data base for searching for the PRID in the data structure; a third server interface to receive an output from the database indicating whether a PRID has been found in the data structure; and a fourth server interface to send the call to a PSAP.

Abstract: A system that incorporates teachings of the present disclosure may include, for example, a Home Subscriber Server having a processor adapted to receive from a Serving CSCF (S-CSCF) device a request for a subscription profile of a communication device to register the communication device, to detect from the request that the communication device is registered with a primary communication resource and that the communication device is to be registered with the S-CSCF device as a secondary communication resource, and to provide the S-CSCF device the subscription profile without de-registering the communication device from the primary communication resource and without directing the S-CSCF device to the primary communication resource. Other embodiments are disclosed.