Abstract: An echo canceller comprises foreground and background filters. The background filter locates and confirms peaks, defines active regions centered about the confirmed peaks and updates coefficients of the foreground filter when the background filter is more effective than the foreground filter A method for improved adaptive echo cancellation comprises configuring a foreground filter, calculating an echo-return loss responsive to the foreground filter, identifying the location of one or more peaks repetitively in a block of data in a background filter, confirming one or more identified peaks over a defined number of blocks before defining an active region equally about the identified peaks in the background filter, filtering the sparse impulse response responsive to the active regions, calculating an echo-return loss responsive to the background filter, and updating the foreground filter when the background filter includes a more effective set of filter coefficients.

Abstract: A framework system serves to translate calls between dissimilar networks. More specifically, the framework system serves to translate calls between dissimilar packet networks and/or between a packet switch network and the public switched telephone network. The system includes a media engine module for terminating and handling channels of data transmitted between the networks in real time. An administrator module provides control and management interfaces for controlling processing applied to each channel. A conduit module serves to enable the distribution of software throughout the framework system allowing the distributed software to use interprocessor communication mechanism in the system. Optionally, a signaling engine module serves to provide access to call control information for connection between two networks.