I have recently moved an asterisk system to a new location. This location is experiencing terrible echo. I installed the HPEC from Digium but that has caused a new problem.
When HPEC is enabled and more that 16 taps are used, the audio from the outside caller gets clipped. Instead of hearing: Hello, my name is Mike one hears He o, m ame ike If the taps are set to less than 16, there is no clipping, but there is significant echo. I don't know if this is relevant, but asterisk does report "No Zaptel transcoder support" on startup. I am at my wits end; any advice would be greatly appreciated. My setup follows: Hardware, AMD Athlon(tm) 64 Processor 3000+, 512MB ram, 2 TDM400p with a total of 5 fxo channels, snom 320 phones OS: gentoo 2006.1 amd64 Software: Asterisk 1.2.17 and Zaptel 1.2.16 (fxotune does not seem to work in this configuration) Also tried Asterisk 1.4.2 and Zaptel 1.4.1 (fxotune does work, but doesn't seem to help in this configuration)
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