Abstract: A system for maintaining SIP application session affinity, the system including a destination inspector configured to inspect a SIP request to determine whether the SIP request indicates as its destination a logical name of a SIP container, a request router configured to route the SIP request to the SIP container that is identified by the logical name if the SIP request indicates as its destination the logical name of the SIP container, and a destination assignor configured to assign the SIP request to a SIP container in accordance with a predefined assignment protocol if the SIP request does not indicate as its destination the logical name of a SIP container.

Abstract: According to one embodiment of the present invention, a system for providing call signaling services to client devices transmits a start channel message on a service topic from a first client device to a service instance. The system publishes from the service instance to the client devices a channel message including a channel topic. The service instance subscribes to the service topic and an associated channel topic. Each client device subscribes to a corresponding client topic. The system transfers signaling information between the client devices and the service instance by publishing signaling information to a channel topic and client topics to establish a communication Channel between the client devices. The system communicates between the client devices by publishing information over the communication channel. Embodiments of the present invention further include a method and computer program product for providing call signaling services in substantially the same manners described above.

Abstract: According to one embodiment of the present invention, a system for providing call signaling services to client devices transmits a start channel message on a service topic from a first client device to a service instance. The system publishes from the service instance to the client devices a channel message including a channel topic. The service instance subscribes to the service topic and an associated channel topic. Each client device subscribes to a corresponding client topic. The system transfers signaling information between the client devices and the service instance by publishing signaling information to a channel topic and client topics to establish a communication channel between the client devices. The system communicates between the client devices by publishing information over the communication channel. Embodiments of the present invention further include a method and computer program product for providing call signaling services in substantially the same manners described above.

Abstract: A system for maintaining SIP application session affinity, the system including a destination inspector configured to inspect a SIP request to determine whether the SIP request indicates as its destination a logical name of a SIP container, a request router configured to route the SIP request to the SIP container that is identified by the logical name if the SIP request indicates as its destination the logical name of the SIP container, and a destination assignor configured to assign the SIP request to a SIP container in accordance with a predefined assignment protocol if the SIP request does not indicate as its destination the logical name of a SIP container.

Abstract: A system for maintaining SIP application session affinity, the system including a destination inspector configured to inspect a SIP request to determine whether the SIP request indicates as its destination a logical name of a SIP container, a request router configured to route the SIP request to the SIP container that is identified by the logical name if the SIP request indicates as its destination the logical name of the SIP container, and a destination assignor configured to assign the SIP request to a SIP container in accordance with a predefined assignment protocol if the SIP request does not indicate as its destination the logical name of a SIP container.

Abstract: According to one embodiment of the present invention, a system for providing call signaling services to client devices transmits a start channel message on a service topic from a first client device to a service instance. The system publishes from the service instance to the client devices a channel message including a channel topic. The service instance subscribes to the service topic and an associated channel topic. Each client device subscribes to a corresponding client topic. The system transfers signaling information between the client devices and the service instance by publishing signaling information to a channel topic and client topics to establish a communication channel between the client devices. The system communicates between the client devices by publishing information over the communication channel. Embodiments of the present invention further include a method and computer program product for providing call signaling services in substantially the same manners described above.

Abstract: According to one embodiment of the present invention, a system for providing call signaling services to client devices transmits a start channel message on a service topic from a first client device to a service instance. The system publishes from the service instance to the client devices a channel message including a channel topic. The service instance subscribes to the service topic and an associated channel topic. Each client device subscribes to a corresponding client topic. The system transfers signaling information between the client devices and the service instance by publishing signaling information to a channel topic and client topics to establish a communication Channel between the client devices. The system communicates between the client devices by publishing information over the communication channel. Embodiments of the present invention further include a method and computer program product for providing call signaling services in substantially the same manners described above.

Abstract: A system for maintaining SIP application session affinity, the system including a destination inspector configured to inspect a SIP request to determine whether the SIP request indicates as its destination a logical name of a SIP container, a request router configured to route the SIP request to the SIP container that is identified by the logical name if the SIP request indicates as its destination the logical name of the SIP container, and a destination assignor configured to assign the SIP request to a SIP container in accordance with a predefined assignment protocol if the SIP request does not indicate as its destination the logical name of a SIP container.

Abstract: A system and method is provided that includes a communication protocol for handling Hypertext Transfer Protocol (HTTP) messages is provided. The communication protocol may include a first protocol (e.g., HTTP channel tunneling) for providing a persistent connection based on the utilization of one or more HTTP methods (e.g., GET, POST, etc.). A second protocol (e.g., Blocks Extensible Exchange Protocol) may be provided for multiplexing a plurality of application protocols for communication over a single connection using the first protocol. The plurality of application protocols that are received from the first protocol may be demultiplexed for processing.

Abstract: Processing mid-dialog SIP messages by receiving a mid-dialog SIP message from a SIP user agent client, creating a new SIP session, associating the new SIP session with the mid-dialog SIP message, identifying an application that is associated with the mid-dialog SIP message, providing to the application the mid-dialog SIP message in the context of the new SIP session, receiving an acknowledgement from the application that the application will accept the mid-dialog SIP message, and responsive to receiving the acknowledgement, providing to the application the mid-dialog SIP message in the context of the new SIP session.

Abstract: Providing SIP application server interoperability, including detecting at a first SIP application server an event necessitating that work be performed in relation to a SIP application session that is managed by a second SIP application server, creating a SIP message object carrying a set of instructions representing the work, and sending the SIP message object for delivery to the second SIP application server and performance of the instructions at the second SIP application server in relation to the SIP application session.

Abstract: A system for maintaining SIP application session affinity, the system including a destination inspector configured to inspect a SIP request to determine whether the SIP request indicates as its destination a logical name of a SIP container, a request router configured to route the SIP request to the SIP container that is identified by the logical name if the SIP request indicates as its destination the logical name of the SIP container, and a destination assignor configured to assign the SIP request to a SIP container in accordance with a predefined assignment protocol if the SIP request does not indicate as its destination the logical name of a SIP container.

Abstract: A system for maintaining SIP application session affinity, the system including a destination inspector configured to inspect a SIP request to determine whether the SIP request indicates as its destination a logical name of a SIP container, a request router configured to route the SIP request to the SIP container that is identified by the logical name if the SIP request indicates as its destination the logical name of the SIP container, and a destination assignor configured to assign the SIP request to a SIP container in accordance with a predefined assignment protocol if the SIP request does not indicate as its destination the logical name of a SIP container.

Abstract: The invention discloses a programming method and system for dynamic client/server network management using proxy servers, by allowing each active proxy server in an arrayed cluster to maintain an updated list of all other operating proxy servers in the cluster. When a client message requesting access to an application server is received by a clustered proxy server, the message may be forwarded to another proxy server (within the cluster) so that message (re)transmissions can pass through the same proxy server as the original message, allowing a proxy server to make consistent routing decisions (and other decisions) pertaining to that message.

Abstract: Providing SIP application server interoperability, including detecting at a first SIP application server an event necessitating that work be performed in relation to a SIP application session that is managed by a second SIP application server, creating a SIP message object carrying a set of instructions representing the work, and sending the SIP message object for delivery to the second SIP application server and performance of the instructions at the second SIP application server in relation to the SIP application session.

Abstract: A method, system and computer program product for limiting extreme loads and reducing fluctuations in load at session servers. An admission rate controller of a SIP router calculates the “deflator ratio” equal to the average number of in-dialog messages received over a first fixed interval of time divided by the average number of out-of-dialog messages received over a second fixed interval of time. Further, the admission rate controller calculates the “dampening ratio” equal to the maximum number of messages allowed over a period of time divided by the number of messages admitted over a previous time interval. When an overload condition has been detected, the admission rate controller calculates the maximum number of out-of-dialog messages to be sent to its associated SIP server based on the deflator and dampening ratios. In this manner, a smoother transition from the overload condition to the non-overload condition may occur.

Abstract: A method, system and computer program product for managing bursts of traffic. A counter, referred to herein as a “frequency counter,” is incremented during those time intervals an overload condition is detected and is decremented during those time intervals an overload condition is not detected. An overload condition may refer to when the number of out-of-dialog messages exceeds a threshold value corresponding to the maximum number of out-of-dialog messages that should be accepted and forwarded to an associated session server. If the count of the frequency counter exceeds some pre-configured value, then traffic that exceeds the threshold for the overload condition is stopped from being sent to the associated session server. Otherwise, traffic that exceeds the threshold for the overload condition is permitted to be sent to the associated session server. By managing bursts of traffic in such a manner, the effective utilization of session servers is improved.

Abstract: A method, system and computer program product for managing bursts of traffic. A counter, referred to herein as a “frequency counter,” is incremented during those time intervals an overload condition is detected and is decremented during those time intervals an overload condition is not detected. An overload condition may refer to when the number of out-of-dialog messages exceeds a threshold value corresponding to the maximum number of out-of-dialog messages that should be accepted and forwarded to an associated session server. If the count of the frequency counter exceeds some pre-configured value, then traffic that exceeds the threshold for the overload condition is stopped from being sent to the associated session server. Otherwise, traffic that exceeds the threshold for the overload condition is permitted to be sent to the associated session server. By managing bursts of traffic in such a manner, the effective utilization of session servers is improved.

Abstract: A method, system and computer program product for limiting extreme loads and reducing fluctuations in load at session servers. An admission rate controller of a SIP router calculates the “deflator ratio” equal to the average number of in-dialog messages received over a first fixed interval of time divided by the average number of out-of-dialog messages received over a second fixed interval of time. Further, the admission rate controller calculates the “dampening ratio” equal to the maximum number of messages allowed over a period of time divided by the number of messages admitted over a previous time interval. When an overload condition has been detected, the admission rate controller calculates the maximum number of out-of-dialog messages to be sent to its associated SIP server based on the deflator and dampening ratios. In this manner, a smoother transition from the overload condition to the non-overload condition may occur.

Abstract: The invention discloses a programming method and system for dynamic client/server network management using proxy servers, by allowing each active proxy server in an arrayed cluster to maintain an updated list of all other operating proxy servers in the cluster. When a client message requesting access to an application server is received by a clustered proxy server, the message may be forwarded to another proxy server (within the cluster) so that message (re)transmissions can pass through the same proxy server as the original message, allowing a proxy server to make consistent routing decisions (and other decisions) pertaining to that message.