Amazon.com: TruVoice HD-750 Premium Corded Double Ear NC Mic Headset with USB and U10P Cable Compatible with Mitel, Polycom VVX, Nortel, Avaya, Shortel, Aastra, Analog Desk Phones and PC (Softphone) : Electronics
Mitel H Series Headsets | Mitel
Amazon.com: TruVoice HD-750 Premium Corded Double Ear NC Mic Headset with USB and U10P Cable Compatible with Mitel, Polycom VVX, Nortel, Avaya, Shortel, Aastra, Analog Desk Phones and PC (Softphone) : Electronics
Amazon.com: RJ9 Office Headset HD Voice for MITEL Nortel Meridian Polycom NEC ShoreTel Xblue Phones, Plus 3.5mm Adapter (Binaural) : Electronics
BlueTooth Stereo Professional Phone Call Headset with USB Dongle for Computer Softphone and iPhone, Noise cancelling Microphone with Digital Signal Processing Audio
Programming a Headset button on a Mitel Phone (Corded Headset) - HeadsetPlus.com Plantronics, Jabra Headset Blog