Radisys Canada Ulc

Radisys Corporation

Radisys Canada Inc.

Neil M Gunn

Adnan Saleem

Yong Xin

Alvin Chubbs

Jagtar Gill

Timothy S Woinoski

Mohammed Aamir Husain

James Davidson

Serguei Smirnov

Tim Woinoski

System and methods provide acoustic echo monitoring and cancellation for real time media processing in an internet protocol (IP) media server in an IP network. An echo monitor is configured to selectively compare audio streams into and out of the IP media server through a selected port. The comparison determines an occurrence of an echo. An echo canceller in communication with the echo monitor is configured to respond to the determination by the echo monitor so as to remove the echo from at least one of the audio streams. A talk burst detector may be used to detect speech in at least one of the audio streams through the selected port. The echo monitor selectively compares the audio streams in response to a signal from the talk burst detector that indicates detection of speech.

Resource efficient acoustic echo cancellation in IP networks

A method of conducting a lawful intercept of real time media packet traffic involves redirecting real time media packet streams between a caller and callee through a media server; replicating the media packet streams within the media server; modifying packet headers of the replicated packet streams; and directing the modified packet streams to at least one monitoring port.

Lawful interception of real time packet data

Systems and methods are provided for a distributed conferencing service through an internet protocol (IP) network. A plurality of tributary mixers are configured communicate with a master mixer or a plurality of master mixers, at least one of which communicates through the IP network. Each tributary mixer is configured to join one or more respective participants to the distributed conference, generate a first mixed media stream by mixing a plurality of ingress media streams from the respective participants, and receive a second mixed media stream from the master mixer. The second mixed media stream includes media from at least one other participant joined to the distributed conference through another of the tributary mixers. Each tributary mixer also provides egress media streams to its respective participants based on a control signal from the master mixer.

Distributed media mixing and conferencing in IP networks

In Voice-over-IP or like systems, audio mixers are used for implanting conferencing applications for IP networks. In such systems, a problem exists as how to pass through user signal events, such a DTMF digits, in-band as well as out-of-band telephony events (RFC 2833/4733) because they are not handled well in such systems. In accordance with the invention, a signalling event in incoming audio packets or user signalling event received out-of-band is detected at one of the inputs. A meta-data representation of the signal event is attached to the audio and passed through the mixer for regeneration, as in-band or out-of-band telephony events, on the other side of the mixer.

Method of passing signal events through a voice over IP audio mixer device

In a media server for processing data packets, media server functions are implemented by a plurality of modules categorized by real-time response requirements.

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Coquitlam, Canada

Neil M Gunn