Cisco Technology, Inc.

Pascal Huart

Luke K Surazski

Michael E Knappe

Richard A Dunlap

Lukasz K Surazski

Jeffrey A Connelly

Devices, softwares and methods send a warning signal when a periodic signal is present in the audio content of a VoIP connection. In response to the warning signal, an acoustic echo canceller of an IP telephone discontinues its adapting process. A signaling network switch detects when a periodic signal is present in the audio content, and issues a warning signal. A signaling call manager device, when it transmits a tone that has periodicity, it also transmits a warning signal.

Devices, softwares and methods with improved performance of acoustic echo canceller in VoIP communication

A method and apparatus is disclosed for providing an improved interface to a caller during the initiation of a VoIP call. The present invention includes placing, by the caller, a request for information regarding a party to be called; returning a URL responsive to the request; and displaying to the caller one or more connection options corresponding to the URL. Additional aspects of the present invention include choosing, by the caller, at least one of the one or more connection options, and placing a call responsive to the one or more connection options chosen by the caller.

Method and apparatus for an enhanced VoIP call initiation interface

Devices, softwares and methods generate, in real time, indexing metadata for select portions of a telephone conversation or conference. The indexing metadata is generated responsive to inputs received while the conversation is being recorded live. The inputs are either by a user pressing a soft key on a telephone device, or by a voice conference bridge determining who is the dominant speaker in a multi-party conference.

Devices, methods and software for generating indexing metatags in real time for a stream of digitally stored voice data

A method and system for call answer while connected to voice mail includes generating real-time packets for transmission of a message toward a voice mail system. Generation of the real-time packets is interrupted upon a call answer by a party generating the message. Generation of the real-time packets for transmission of the message toward the voice mail system is resumed after a delay associated with the call answer. An indication is provided to the voice mail system that the real-time packets generated subsequent to the delay follow the real-time packets generated prior to the delay in the message by a time amount less than the delay.

Method and system for call answer while connected to voice mail

A communication system includes a destination that receives voice samples and a voice parameter generated by a source. The destination uses the voice samples and voice parameter to reconstruct voice information in response to a packet loss. The destination may reconstruct voice information from multiple sources.

Method and apparatus for reconstructing voice information

A method for synchronizing media in a call includes receiving a first input stream of packets of a first media type at a first call resource, generating a first output stream in response to the media streams, receiving synchronization information from a second call resource, and communicating the output stream from the first call resource to a endpoint in synchronization with the second call resource. A video conference bridge includes a first interface operable to receive a video input stream, a processor operable to generate video output, and a second interface operable to receive synchronization information from an audio conference bridge.

Method and apparatus for adding functionality to an existing conference call

Devices, softwares and methods with improved performance of acoustic echo canceler in VoIP communication

Methods for concealing audible distortions resulting from changes in jitter buffer size include receiving an audio stream, storing the audio stream in a jitter buffer, and determining a pitch period associated with the audio stream. To expand the jitter buffer, a method includes inserting additional audio data that has a duration corresponding to an integer multiple of the pitch period into the audio stream. To contract the jitter buffer, a method includes removing a portion of the audio stream having a duration corresponding to an integer multiple of the pitch period.

Method and apparatus for concealing jitter buffer expansion and contraction

A communication system includes a server, a call manager, and a plurality of network endpoints. The network endpoints are assigned to network regions to allow selection of a proper compression/decompression algorithm (codec) for a call between the network endpoints. In one embodiment, the server receives a request for a network address from a network endpoint, and communicates the network address and a network location parameter identifying a network region to the endpoint. In another embodiment, the call manager receives a call request from a network endpoint and determines a network region for the endpoint based on the endpoint's network address. In yet another embodiment, an endpoint determines its own network region based on its network address.

Method and apparatus for dynamically assigning a network endpoint to a network region for selecting a proper codec

A network device and its mode of operation. The network device includes an input port through which audio streams may be received. A controller receives a user input indicating which type of mix the user wants applied to the audio stream and applies the mixing factor designated. The mixing factor may be a stereo mix, a panned mix, or a mono mix. The network device also includes an output port through which the mixed audio stream can be transmitted to the user.

Enhanced spatial mixing to enable three-dimensional audio deployment

According to one embodiment of the invention, a method for managing call requests in a limited bandwidth environment includes receiving a call request from a user, determining if a voice channel on a communication link is available for the call request, and providing a feedback signal for the user indicating when a voice channel will be available.

Method and system for managing call requests in a limited bandwidth environment

A method is disclosed, where the RX unit of an IP telephone waits for a first silence indication packet to be received. When the first silence indication packet is received, the RX begins attenuating incoming packets. The rate of attenuation may occur at a rate responsive to an indication provided by the TX unit. The RX unit also mixes comfort noise with the attenuated incoming packets. The RX unit the waits for a second silence indication packet to be received. When the second silence indication is received the RX unit mixes in comfort noise at a level responsive to an indication provided by the TX unit. The RX units then waits for voice packets to be received from the TX unit. When normal voice activity resumes, the RX unit stops the generation of comfort noise and begins playing voice packets again.

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Dallas, TX, United States of America

Pascal Huart