The touchscreen goes black after I dial a number and press "call". At that point I am unable to activate any buttons and therefore cannot enter extension numbers, menu options, access voicemail, or even end the call. I have to wait for the person I dialed to end the call first.

Asked by Theresa on 07/19/2014 0  Answer

ManualsOnline posted an answer 9 years, 11 months ago

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