A method of maintaining transport address associations in a transport address translation entity connected in series between a first device and a second device is disclosed. The first device can use a first transport protocol to send a first message to cause the transport address translation entity to make a first association of a first public address with a first private address. On receiving a response to the first message from the second device, the first device can use a second transport protocol to send a second message to cause the transport address translation entity to make a second association of a second private address with a second public address and with the second transport protocol. The second message can contain correspondence information that is also contained in the first message and/or in the response to the first message.

Disclosed are methods and devices (e.g. servers) for establishing a real-time communication event between a user of a client device and another user of another client device via a communication network. A message pertaining to the communication event (e.g. to a communication event establishment procedure) includes multiple options pertaining to the communication event and, for each of the multiple options, a different network address unique to that option which can be accessed to select that option.

A virtual desktop server include an application framework comprising a real-time media application to provide real-time communications (RTC), a native RTC engine to execute a portion of the real-time media application when received, and a processor coupled to the application framework and to the native RTC engine. The processor redirects original application program interfaces (APIs) of the real-time media application intended for the native RTC engine based on redirection code injected into the real-time media application so that the portion of the real-time media application is to be redirected. The processor receives from a client computing device capabilities of the client computing device to execute the redirected portion of the real-time media application. The processor switches to a fallback mode if the client computing device has limited capabilities.

In one embodiment, a device in communication with a service provider network obtains first information regarding a first call leg of a media session associated with a first endpoint. The device also obtains second information regarding a second call leg of the media session associated with a second endpoint. Both of the first and second endpoints are anchored in the service provider network. The device makes a determination that the media session is being hairpinned, based on the first and second information. The device sends, based on the determination, an indication message using Session Traversal Utilities for Network Address Translators (STUN) along the first call leg that causes the first endpoint to begin sending a flow of media packets.

Systems and methods are disclosed for establishing connections between computing devices. A first computing device may communicate data via a symmetric NAT and a second computing device may communicate data via a cone NAT. The first computing device may establish a connection, such as a peer-to-peer (P2P) connection, between the first computing device and the second computing device via the symmetric NAT and the cone NAT.

An improved system and method are disclosed for peer-to-peer communications. In one example, the method enables an endpoint to engage in a call with another endpoint using a third party instant message system to carry instant messages containing signaling information and a route that is external to the third party instant message system for both signaling and media information.

Managing network ports is disclosed. Network session identification information is received. The network session identification information is associated with a destination IP address and a destination network port. An available source network port is determined using a data structure that is based on the destination IP address and the destination network port.

Contact information in SIP signaling messages is modified at each in-path network device during the signaling process (along with storage of mapping information) to allow the in-path network devices (and proxy server) to identify the next (or previous) hop device in the path, and thus, maintain the path taken by signaling messages early on during the signaling process. Subsequent request and response signaling messages transmitted during the session follow this path, which ensures that the in-path network devices remain in the SIP signaling path.

A system and method is disclosed to transform Over-The-Top (OTT) call log data collected by telecommunications network operators into a peer-to-peer log in order to determine more accurate information. In this method the IP addresses in the call log records are compared to a list of known mediator server IP addresses and the records in the log that contain mediator server IP addresses are removed from the log to create a peer-to-peer log containing only those records that contain peer IP addresses. The data in the peer-to-peer log can then be categorized with confidence to determine network performance information as well as, for example, the percentage of traffic to a particular country. Conclusions may then be inferred regarding the removed data records based upon the data found in the peer-to-peer log.

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.