According to one aspect, a system and method of exchanging GRUUs (Globally Routed User Agent URI (Uniform Resource Identifier)) between a first telephony-enabled device and a second telephony enabled device using a circuit-switched message is provided. Once exchanged, the telephony enabled devices can exchange SIP (session initiated protocol) communications routed by the GRUUs. Any one of the telephony-enabled devices can add a media component to the SIP communications. According to another aspect, a system and method of generating GRUUs is provided. According to another aspect, a system and method of handing off communications to a packet switched network from a circuit switched network is provided.

Systems and methods for clustering emergency services routing proxies are provided. The described features allow a group of ESRPs running as individual servers or a group of virtual servers, to be referenced using a single URI. In one implementation, an emergency services routing proxy device includes an emergency services routing proxy node configured to route a call to a downstream entity, the call received from an upstream entity. The device further includes a cluster manager configured to receive registration information from the emergency services routing proxy node, the registration information including a routing service identifier. The cluster manager may be further configured to identify the emergency services routing proxy node for call routing based on a comparison of an identifier included in the call with the routing service identifier.

Methods and systems related to supporting real time communications are disclosed. In one type of a real time communication session, prior to an offer and acceptance to perform real time communications, a communication channel may be established between a caller device and a callee device. Information related to addresses of the caller and callee devices can be contained in, or pointed to, by a Universal Resource Locators (URLs) for the caller and callee devices. A network computing device may communicate messages relating to establishing and maintaining the communication channel between the caller and callee devices. In a scenario where the network computing device becomes unavailable, another network computing device can use the URLs and other channel information that may be stored in the database, to handle messages. In one embodiment, messages identify the caller or callee devices, to which each message is directed, using target URLs (caller and callee URLs), which reduces the need to access information related to the intended target.

Methods and systems are provided for automatically joining a user in a conference meeting via alternative communication devices when the user is detected to be unavailable at a particular client communication device. The client communication device of the user determines that the presence of the user is set to away, indicating that the user is unavailable at the client communication device. When the client communication device determines that a conference meeting including the user as an active participant is about to begin, the client communication device determines an alternative number, and different communication device, at which to reach the user. Using the alternative number, the client communication device calls the user at the different communication device and, when answered, automatically joins the user into the conference meeting through a communication channel provided by the client communication device.

A system is provided for providing communication event routing and transfer capability in a multi-site communication-center environment. The system utilizes a presence protocol application and a routing application for determining availability of an agent or system and for setting up the transfer from a point of transfer on a network to a destination of transfer on the same or connected network. In a preferred use the presence protocol application is shared by communication-center sites cooperating in the transfer and routing of events and the presence protocol enables at least one event-handling process normally performed by the routing application.

Providing a proxy server feature includes initiating the proxy server feature at an endpoint of a number of endpoints. Registration information comprising addresses for the endpoints is received and then stored in a routing table at the endpoint. The endpoint locates a callee endpoint using the routing table in order to establish a session with the callee endpoint.

A method includes receiving, at a network component of a first carrier network from a source device, a telephone number of a destination device configured to communicate via a second carrier network. The method further includes in response to a query message sent to a telephone number mapping device of an internetwork packet exchange network, receiving a name server record at the network component, the name server record indicating a domain name associated with a second telephone number mapping device of the second carrier network. The method also includes in response to the network component sending the domain name to a domain name server of the internetwork packet exchange network, receiving an Internet protocol address of the second telephone number mapping device. The method includes sending, from the network component to the second telephone number device, a second query message based on the Internet protocol address.

A network address translation traversal system and method for real-time communications are provided. The network address translation traversal system includes a user terminal equipment, a network address translation device, a signaling control system and a peer terminal. The user terminal equipment is in a private network, while the signaling control system and the peer terminal are in a public network. The signaling control system is configured to instruct the network address translation device to create a network address translation mapping for a real-time communication connection. The peer terminal is configured to create the real-time communication connection with the user terminal equipment via the network address translation device directly according to the network address translation mapping.

A computer aided prioritization (CAP) system may receive, from the emergency event reporter device, an emergency event including a priority selected from a set of event priorities and a type of event selected from a set of event types associated with the selected event priority; determine, based on the emergency event and without querying the emergency event reporter device for additional information, whether the emergency event indicates a higher priority emergency event to be handled by a computer aided dispatch (CAD) system or a lower priority emergency event to be handled automatically by a computer aided event module (CAEM); and selectively route the emergency event report to at least one of the CAD system and the CAEM according to the determination.

Systems, methods, and apparatus for providing real-time voice communication between devices connected to an Internet Protocol (IP) network and devices connected to a public switched telephone network (PSTN). In one implementation, the system includes a computer-controlled switch for connection to a local PSTN, for receiving calls from the IP network and the PSTN, and for routing calls to the PSTN and the IP network; and gate interface circuitry connected to the switch and adapted for connection to the IP network. The gate interface circuitry includes gateway circuitry for interfacing the IP network and PSTN voice circuits, and gatekeeper circuitry for performing address translation, admission control, bandwidth management, and zone management. The switch stores at least one PSTN destination address and at least one IP network destination address for each subscriber. The switch routes an incoming call to any one of the destination addresses stored for the subscriber.