Reliability issues with headset control via EHS

[bpen32]

I have a T48g firmware 35.72.0.30 with and ehs36 firmware 3.16.0. Both of which are the latest firmware available. Ive tried two different headsets 1. CS540 Plantronics and 2. GN Netcom 9350e (Jabra). I have triple checked to make sure that I have the correct cables/plugs used for the specific brand, and here are my results.

Plantronics CS540 - Cannot initiate a call from headset or hang up, period. I cant answer a call by pushing the hook/switch button and then pressing the already lit up Headset button on the T48g... but it already works (if you can call it that) that way without the EHS36.

(Jabra) GN Netcom 9350 - I can initiate and hang up calls, but I have to press the H/S button on the headset 3-7 times to get it to initiate, and 3 times every time to hang up.

This is obviously in no way shape or form reliable or acceptable. What do I need to do to get this major issue resolved? I purchased 5 EHS36's for my new phones in my office and they are basically worthless. I have upgraded them all as per the upgrade instructions, and have tried 3 of them, only to fine that they function the exact same.

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Ive also tested on T46G's with the latest firmware on your site, and the 28.72.0.205 for ehs36 upgrading, with the same results as the T48G.