handsets
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Vertical / Vodavi STS Series / Infinite
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Toshiba 2000/6500 Series Handset
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Avaya 9600 Series push to talk Handset
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Polycom VVX 250/350/450 HD Handset
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Mitel 5200 IP Handset
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Panasonic Handset for KX-T7665/T7667/T77xx/TA308xx (reverse polarity)
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Cisco Wideband Handset (CP) 7906,7911,7941,7942,7945,7961,62,65,70,75)
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Cisco IP Phone Handset
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Siemens Optipoint Handset