Microsoft Technology Licensing, LLC

Tony Bell

Rod G Fleck

John David Bruner

Mahendra D Sekaran

Sankaran Narayanan

Humayun Mukhtar Khan

Namendra Kumar

Jeffrey B Kay

Gursharan Singh Sidhu

Abhilash Chandrasekharan Nair

Vishal Soni

Anish Desai

Mansoor Jafry

Wajih Yahyaoui

Gaurav Pancholi

Ken Wolfe

Voice call continuity is provided for calls that are carried over a hybrid network infrastructure in which access connections are distributed over loosely coupled network portions including a backend network such as a core VoIP (Voice over Internet Protocol) service network, one or more cellular mobile networks, and a public switched telephone network ('PSTN'). The calls are routed through the core VoIP network regardless of their points of origination or termination in other network portions so that signaling and call context are anchored in the core VoIP network. The conditions under which user equipment operate are continuously monitored so that when a connection is determined to have been unacceptably degraded or is likely to be interrupted, and/or a more optimal connection is available, a handover of the call to another connection is initiated so that call continuity is maintained using the lowest cost connection that provides acceptable call quality.

Voice call continuity in hybrid networks

Techniques to manage a relay server and a network address translator are described. A system may include a relay server having a first private network interface operative to communicate with a private client, a second private network interface operative to communicate with a network address translator, and an enhanced relay manager module operative to receive a message from the private client over the first private network interface or a remote client over the second private network interface and through the network address translator, the enhanced relay manager module further operative to retrieve a public transport address and a mapped port for the network address translator from a mapped address attribute stored by the relay server, and send a response to the message with the public transport address and the mapped port to the private client or the remote client. Other embodiments are described and claimed.

Techniques to manage a relay server and a network address translator

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Tony Bell