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The Aastra extra key panel is an add on unit designed to attach to the Aastra Dialog range of telephones. Not all the Dialog phones have the capability of attaching an expansion key panel as not all of the models have the slots. Aastra Phone Compatibility The Aastra Dialog phones that are compatible with the extra key panel unit are the Dialog 4222 ndash 1 Extra Key Panel Only Dialog 4223 ndash 1 4 Extra Key Panels Dialog 4224 ndash 1 4 Extra Key Panels Dialog 4225 ndash 1 4 Extra Key Panels Dialog 4425 IP ndash 1 4 Extra Key Panels Dialog 4422 IP ndash 1 Extra Key Panel The unit comes with 17 programmable extra keys that the user can set to their preference. Also the extra key panels are available in both light and dark grey just like the phones.
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