We have M12 plantronics amplifiers with the head sets. The headset works if you unplug it from the amp and plug it directly into the phone. But if you plug it in with the amp it does not work. Unfortunatly this is causing issues since with the headsets and no amps the volume over the headset is very low regardless of how much you turn the volume up on the phone. Any one run into this elsewhere?
We use many Plantronics Headsets without the M12 and don't have any issues. What Phone model are you using these with? The M12 is unnecessary for IP Phone models with the built-in Headset Jack. For other models like the 7906,7911 the M12 has to plug into the Handset Jack and then the Handset Cord plugs into the M12. If you must use the M12 you may need to adjust the Phone/Compatability setting slide (located under door on Left-Hand side of the M12)
What model of Plantronics Headset are you using? The one part you may need which is required for all "corded" Plantronics Headsets (to go from Headset Jack on 7941 to "Quick Disconnect" on Headset) is;
The GN Netcom should work fine with the proper cord :) We did test them out at one point but chose Plantronics. The cords for different models of phones have the Transmit and Receive flipped in most cases;
The cord that you need is;
Cisco IP phones 79xx series **No 8800-00-37
The cord you currently have;
Plantronics Vista Base No 8800-00-20 **For use with Phones like the Nortel 3904
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