SL>> I called NetComm and they confirmed that it was, indeed, a capacitor and

 SL>> that it was used to regulate power on the phone line but 

 SL> I've noticed that many modern phones can be set to either NORM (normal) 

 SL> or

 SL> 600 Ohms and this is supposed to affect the sidetone, but I've only seen

 SL> references to the 600 Ohm resistance when connected to *some* PABXs.

 SL> If I toggle this switch on my phone the sidetone is slightly louder and

 SL> slightly higher pitched, but no great difference.



I understand that you set the switch from Norm to 600 Ohm when you had more

than one phone on the same line. Suppose to cancel out the Echo that you hear

when two people in the same house are using the phone



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