I have a new asterisk server (details and conf files below) with a TDM421p (2 fxs (phone), 1 fxo (pstn)).

 

Noisy FXS lines. (analog phones connected to TDM400 fxs modules)

On the fxs lines there is a low static hiss all the time. For example, if I pickup and press any key to break the dial tone, I hear the hiss. It continues whether I make an internal call or call out using the pstn line on the fxo module.  It is useable, but it is a lot worse that connecting the phone to my pstn directly. I have tried multiple phones. What should I expect?

 

Q1: Can (should) the clarity of the TDM21p fxs line be as good as a (not so good) pstn line?

 

Q2: Will the noise on the line be affected by any parameters in the zaptel.conf or Zapata.conf files? I did not see any that seems to be related.

 

Thanks,

 

--BobG

 

 

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