Abstract: Particular embodiments provide for attenuating one or more microphone signals in a teleconferencing system upon detecting a non-audible signal. A far end voice signal is received from a sound source. A non-audible signal is added to the far end voice signal to create a composite signal, which is provided to one or more speakers. The speakers output the composite signal and the non-audible signal are detected in the composite signal after the composite signal is received at one or more microphones. The non-audible signal allows an attenuator to attenuate a microphone signal including the composite signal from a particular microphone in response to the detected non-audible signal to reduce far end echo.

Abstract: An echo canceller apparatus comprises a receive side attenuator coupled in a receive side signal path that is configured to couple from a conference call bridge to a caller; a convolution processor coupled to the receive side signal path at a convolution processor pick-off point; a double-talk detector coupled to the receive side signal path and to a sending side signal path that is configured to couple from the caller to the conference call bridge; and logic coupled to the receive side attenuator which when executed is responsive to a double-talk condition detected by the double-talk detector and operable to determine a level of echo canceled by the convolution processor, to determine an additional amount of attenuation to introduce, and to activate the receive side attenuator to introduce the additional attenuation.

Abstract: In one embodiment, an echo canceller configured to cancel echo in a wideband voice conference is provided. A double-talk condition may be when a plurality of users are speaking substantially simultaneously. When a double-talk condition is detected in the wideband conference, a high-frequency process is enabled and used to process signals in the high band to reduce echo. Accordingly, echo in the high band may not be produced by end devices being used by the users' speaking. Also, the users speaking have the echo cancelled in the low band and substantial echo does not result. This results in the users speaking experiencing the conference in the narrowband. The other users that are not speaking, however, continue to receive wideband signals. The users not speaking also continue to have echo cancellation performed for the high band and low band because these users are not speaking and thus attenuation of their voices is not a consideration.

Abstract: An apparatus and method of buffering a media stream is provided. The method may comprise receiving a plurality of IP packets of the media stream, each packet providing a fragment of a portion of the media stream. Thereafter, the portion of media stream may be buffered in a jitter buffer using the fragments provided by the received packets. Further, the portion of the media stream may be buffered in a replay buffer using the fragments provided by the received packets. The replay buffer may be larger than the jitter buffer and a first received fragment and a second received fragment may be combined. The second received fragment may have been discarded by the jitter buffer. A media stream may then be played back using media from the replay and/or jitter buffer.

Abstract: In one embodiment, a method for providing voice quality assurance is provided. The method determines voice information for an end point in a voice communication system. The voice information may be from an ingress microphone. The method determines if the voice quality is considered degraded based on an analysis of the voice information. For example, the voice information may indicate that it is distorted, too loud, too soft, is subject to an external noise, etc. Feedback information is determined if the voice quality is considered degraded where the feedback information designed to improve voice quality at an ingress point for a user speaking. The feedback information is then outputted at the end point to the user using the end point.

Abstract: An embodiment may include an apparatus comprising a dejitter buffer to receive packets containing audio data, a codec coupled with the dejitter buffer, the codec to receive coded audio frames from the dejitter buffer and decode them, and a concealed seconds meter coupled with the dejitter buffer, the concealed seconds meter to record concealment events by the decoder to provide an objective measure of media impairment. Another exemplary embodiment may be a method comprising receiving packets containing audio information at a dejitter buffer, decomposing the packets to coded audio frames, sending the coded audio frames to a decoder and decoding the frames, generating a concealment output stream if the decoder does not receive a valid frame from the dejitter buffer, and recording concealment events to provide an objective measure of media impairment.

Abstract: A method and a network device for controlling a jitter buffer are disclosed. The method comprises providing a jitter buffer to counter the effect of jitter in a communication channel and comprises determining a duplex mode of the communication channel. The method further comprises adjusting parameters of the jitter buffer in response to determination of the duplex mode, half-duplex mode and full-duplex mode respectively having respective sets of parameters associated therewith. A network device comprises a jitter buffer to counter the effect of jitter in a communication channel and a controller operable to determine a duplex mode of the communication channel and to adjust parameters of the jitter buffer in response to determination of the duplex mode, half-duplex mode and full-duplex mode having respective sets of parameters associated therewith.

Abstract: A method for adaptive media quality monitoring includes monitoring at least one metric of a call between at least two endpoints and detecting a threshold crossing event via the monitoring of the at least one metric. The method also includes executing a threshold crossing action based on detecting the threshold crossing event. The threshold crossing action comprises monitoring at least one additional metric of the call.

Abstract: A method of balancing traffic loads to a plurality of customer automatic l distributors (ACDs). Each ACD periodically transmits call congestion data to a central data base. Periodically, the data is automatically analyzed and resulting call routing information stored at the data base. The call routing information is queried in response to each call directed to the customer to select and ACD for routing of the call. Other signals are independently sent from the ACDs to the data base to indicate the present availability of trunks. A given call may or may not be routed to the selected ACD depending upon the status of these signals. In this case, the ACD selection process is repeated at the data base.