Avaya Inc.

Avaya Canada Corp.

Eric Cooper

Mehmet Balasaygun

Joel M Ezell

Harsh V Mendiratta

Alan Bernard Johnston

Behrouz Poustchi

Rifaat Shekh-Yusef

Philip Matthews

Gordon Richards Brunson

Tibor Lukac

Stephen Andrew Baker

Al Baker

Mohan Vinayak Phadnis

James Andrew Stelzig

Sreekanth Subrahmanya Nemani

Sanjog Kotnis

Anand Padhye

A communication session is established between a first communication device and a second communication device. The communication session comprises a first dialog between an application server and the first communication device. The first communication device uses a first network address in the first dialog. In response to an event, such as a first network interface failing, a SIP INVITE with replaces header message is received by the application server with a second address of the first communication device. In response to receiving the SIP INVITE with replaces header message from the first communication device with a second address of the first communication device, the first dialog between the application server and the first device is reestablished using the second network address.

Reestablishment of session initiation protocol (SIP) dialogs

A communication device sends a Session Initiation Protocol (SIP) INVITE message to establish a call. In response, the call is forked. For example, in parallel forking, the SIP INVITE may be sent to two different communication devices. The forking causes each communication device to send at least one provisional response message. In this case, first and second SIP provisional response messages are received that include Session Description Protocol (SDP) information for a media stream. A first media stream associated with one of the first or second SIP provisional response messages is received and played. A second media stream associated with the other one of the first or second SIP provisional response messages is received within a first time period. In response to receiving the second media stream within the first time period, the first media stream is discarded and the second media stream is played.

Early media handling

A first Session Initiation Protocol (SIP) INVITE message is received to establish a communication session where a communication application, in a first communication endpoint that is used to establish the communication session has been suspended or is not running. A first message is sent that causes the communication application to become active. A second message is received from that indicates that the communication application is active. Various processes are then used to establish the communication session with the previously suspended or not running communication application.

System and method for providing to push notifications to communication endpoints

The system and method detect and properly handle a glare condition in a SIP communication session. A glare condition is where a communication device has two concurrent outstanding requests (typically an incoming and an outgoing request that have not be acknowledged) and needs to process one of the requests before processing the other request. To detect a glare condition, the system and method identify that an out-of-dialog SIP request is received while an outgoing SIP request is pending. In response to detecting the glare condition, a glare algorithm is initiated. The glare algorithm ensures that outstanding requests will be handled in a timely manner.

Mechanisms for handling SIP glare across multiple dialogs

A joining peer is bootstrapped into in a peer-to-peer (P2P) network in the presence of network address translators (NAT). A bootstrap peer is contact by the joining peer to establish a connection between the joining peer and an admitting peer in the peer-to-peer network. The joining peer receives an indication from the bootstrap peer that the connection between the joining peer and the admitting peer has been established with a message path through the bootstrap peer. The indication includes contact information for the admitting peer. The connection is them modified to remove all proxies therefrom.

Bootstrapping in peer-to-peer networks with network address translators

A method and system of enabling communication between peers in a peer-to-peer (P2P) network in the presence of network address translators (NAT). The method includes: assigning a unique peer identifier to each one of the plurality of peers in the P2P network; establishing an overlay topology connecting each peer to a subset of the plurality of peers in a structured connection pattern based on the unique peer identifier of each peer, each one of the plurality of peers having more connections to close peers and fewer connections to distant peers; and routing messages between peers through the established overlay topology.

Peer-to-peer communication system and method

Provided are methods, devices, and systems for maintaining a SIP survivable network. A SIP endpoint maintains an ordered list of the controllers that are available to it and registers with a subset containing the first N controllers in the list, where N is a plurality, but not all, of the controllers in the list, and obtains services from one or more of the controllers of the subset. If one of the controllers of the subset becomes unavailable, the endpoint registers with the (N+1)controller in the list, thereby adding it to the subset. If and when the one controller becomes available again, the endpoint de-registers with the (N+1)controller, thereby removing it from the subset, and if necessary re-registers with one controller. The subset thus forms a sliding window on the list.

Registering an endpoint with a sliding window of controllers in a list of controllers of a survivable network

Systems and methods for announcing and locating services that are shared in a distributed manner within a peer-to-peer packet-based network are provided. One or more network devices maintain a copy of a particular service and the service is shared by any network device in the network that requires the service. Network devices maintain lists of what services are available on the network as well as where the services are located. When a particular service is desired, the network device consults the lists and is able to request acquisition of the service from any network device known to host the service, either locally or on a remote network device. Service location functionality is also capable of allocating resources and/or services in the network based on statistical information gathered and maintained regarding service use in the network.

System and methods for announcing and locating services in a distributed peer-to-peer network

A plurality of local networks each have one or more terminal sets and a message re-director. The message re-directors are adapted to communicate with each other across another network through edge devices. The message re-directors are also adapted to convert multicast messages received locally from the terminal sets into unicast messages for transmission across the other network. The unicast messages are received by the other message re-directors. Each one of the other message re-directors then multicasts information received as part of the multicast messages received to the terminal sets within its local network.

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Kanata, Canada

Eric Cooper