search for: tdm401b

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2006 Jun 16
3
Echo and crackle
...distracting echo. In addition to that there is occasional heavy crackle or static. I have tried to follow the guidelines at : http://www.voip-info.org/wiki/view/Asterisk+echo+cancellation but it does not seem to have made much difference. Currently we are using a X101P for the POTS line and a TDM401B (TDM400P with one FXS port) for the conventional telephones. From what I have read, it may help to use an FXO port on the TDM400P rather than the X101P for the POTS line. What is the "conventional wisdom" about the echo in this configuration and what causes the crackle and how shoul...