This is a very useful SOHO headset amplifier.  It allows you to switch between the telephone and your computer's audio (voip) or Messenger audio etc.) using the same headset.

It should be noted that you must use one of the professional Plantronics telephone system headsets and not a PC headset or cordless/cellular headset.  The Plantronic headsets are very good but have different connectors than standard cordless/cellular headsets.

Only problem is, this unit has had a slight humming line noise when used with the telephone since it was new.  Since my phone wasn't on the official Plantronics compatibility list, I assumed that my low cost phone was probably to blame.

I just replaced my old phone with a two line AT&T 992 SOHO phone that should be compatible - it's not on Plantronic's compatibility list, but there are SO many phones out there I don't know how they could possibly check all phones on the market (or even a fraction of them).  After all, it's nearly impossible to look at the compatiblity list and try to buy a phone that meets your needs and is also on the list.  The MX-10 is supposed to have "near universal compatibility".

This new phone has the same line hum as the old phone (both are AT&T phones).

I sent for a replacement MX-10, so we'll see if there's a problem with the amplifier or a compatiblity issue with both of my AT&T phones.

The headset is crystal clear when used through the soundcard of the computer in all of the audio programs that I use.
This is a very useful SOHO headset amplifier. It allows you to switch between the telephone and your computer's audio (voip) or Messenger audio etc. ) using the same headset. It should be noted that you must use one of the professional Plantronics telephone system headsets and not a PC headset or cordless/cellular headset. The Plantronic headsets are very good but have different connectors than standard cordless/cellular headsets. Only problem is, this unit has had a slight humming line noise when used with the telephone since it was new. Since my phone wasn't on the official Plantronics compatibility list, I assumed that my low cost phone was probably to blame. I just replaced my old phone with a two line AT&T 992 SOHO phone that should be compatible - it's not on Plantronic's compatibility list, but there are SO many phones out there I don't know how they could possibly check all phones on the market (or even a fraction of them). After all, it's nearly impossible to look at the compatiblity list and try to buy a phone that meets your needs and is also on the list. The MX-10 is supposed to have "near universal compatibility". This new phone has the same line hum as the old phone (both are AT&T phones). I sent for a replacement MX-10, so we'll see if there's a problem with the amplifier or a compatiblity issue with both of my AT&T phones. The headset is crystal clear when used through the soundcard of the computer in all of the audio programs that I use.