Horrible metallic sound on windows softphone

[cm1601com]

Dear all,

I have a weird problem when phoning via my 3cx-Softphone on Windows 10:
The person on the other side of the line (does not matter if 3cx/internal or mobile/landline/voip) hears my voice in an incredibly metallic sound. My voice crackles and is cutoff often.

In worst cases, you can hear a metallic "musical scale" (first ascending, then descending) when nobody is speaking.

At first, I thought it was our hardware environment (Wifi, DSL too slow, 3cx on-premise overloaded, ...), but then we found out that it only(!) occured using the Windows softphone.
Using the 3cx Webclient at exactly the same configuration has perfect sound quality, and the smartphone app also sounds excellent.
(However, I still restrain using both of them due to my problems with headset button call answering; I made separate threads for this issue in the adequate sections of this forum)

The Codec order is: G722, G711-A, G711-U, GSM, G729.
Always when I consulted Wireshark, the Codec G722 was used (which, again, was fine with the web/mobile client).

Do you have any idea what could be the problem with the 3cx Windows Softphone client?

Thank you very much!

 

[JohnS_3CX]

Hi @cm1601com

Please try to go in the client audio options and reduce microphone gain to 0.5 (lowest setting) and see if that improves the situation

 

[iversion-Support]

Hi cm1601com

What head set are you using, we had similar issue wit Logitec wireless headset, it was too sensitive even catch fan, or air condition air flow voice.

Solution
Search Sound in the windows, in the sound council on windows 10 click on recording devices, select your Microphone and click Properties then click on Level and reduce it down to 1 or 2 then try. You may have to play around a bit to find the optimum level.

Also make sure in the 3CX software client you set the desire microphone as default device for Mic. The settings in the sound are per device.

See image attached.