Digium 1VPMOCT032LF Analog Echo Cancellation Module

Digium 1VPMOCT032LF Analog Echo Cancellation Module This product is a replacement for: Digium - Thirty-two Channel Hardware Echo Cancellation Module (1VPMADT032LF)Thirty-two (32) Channel Hardware Echo Cancellation Module for use on Hybrid, AEX/TDM2400 and TDM400/800 cards Support for this module requires Switchvox version 5.1 and DAHDI driver version 5.1. For Asterisk users who connect to the PSTN, the most common type of echo is hybrid echo - the echo introduced by the impedance mismatch between 2-wire and 4-wire telephone circuits. The echo manifests as a distorted and delayed reflection of the users voice while in conversation with an external party through the PSTN. Asterisk itself offers a range of software-based open source echo cancellation routines that are moderately effective in eliminating the hybrid mismatch echo that most Asterisk users experience. However, there are cases in which these algorithms are not effective. To combat this, Digium introduced DSP-based echo c