Are you using this in Key system/Blend or PBX mode?
Do you have a SPA8800 in your network?
It is best to run the impedance matching tool by placing a call to a landline where you can mute the call. The tool will generate a series of tones from the UC320W and then measure the reflection of sound back to determine the best settings. Landlines give the best audio quality.
It is normal to have different impedance values for each FXO.
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