Very low quality when receive incoming pstn calls

Hello,

Any advice or tip in how to get the best voice quality when receive a incoming call from a pstn line?

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Armando

Hi,

First please try to answer the incoming call from FXS port, Make sure the line is ok, If so then check your network or change the codec. If the voice is low , I think you can change it in the web with this value "rxgain".

Best regards
upper

Hello hua,

I didn't meant low volume, what I tried to say is that the quality of the incoming voice is poor.
Using Asterisk CLI command "sip show channels", always use the ulow (g711) codec for incoming calls. Is there a way to force transcoding to g729 or to g722?

Thanks for your quick response btw

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Armando

HI

Let us talk by skype .This is my ID upper.hua .

Best regards
upper

Hello hua,

I'd really like you to solve this thread using this forum instead using skype, this way all other members will know how to solve when the same issue occurs.

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Armando

Hi,

Sure, But it is inefficiency. By the way waht do you mean about the voice quality .Noise/echo or low voice or something else?
If has echo , Please enable the echocancel value;
If has noise, Please try to answer the call with Analog phone which connects FXS port, Not use IP phone;
If low voice,please adjust the rxgain/txgain value;
Please describle your problem .