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Compatibility Slide Switch: The bottom of the MDA100 QD has a slide switch with letters A-F. Research your phone’s natural Direct Connect Cable for correct compatibility setting.
A = U10
B = A-10
C = U10P
D = HIS
E = U10P-S
F = HIC
Computer USB-A, Desk Phone
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– June 19, 2018
Purchasing the switch from Headsets direct was very easy. I had some questions about compatibility and called in they were very helpful. I have them the model number of the Cisco phone that I use and they not only confirmed the product was compatible they told me the settings that needed to be checked so I could easily use it right away
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