One of my clients is trying to train personnel on a 2420 phone. They use the S12 Amp with headset. Phones have the headset button hard coded. I have a Y-adapter that I have plugged into the headset output jack of the S12. I get no dial tone when activated. I used a HIS cord and when I use that i get one way audio. Caller cannot hear me. Should I be using the HIC cord? Any suggestions??? Is there a compatible headset I can use that will plug directly into the headset jack of the 2420 without utilizing the S12. Everything I have tried so far is not working.
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