7920 Wireless IPPhone missing buttons

Unanswered Question
Aug 21st, 2007

A customer has a Callmanager 5.0 with approximately 20 7920 IPPhones.

All phones have the problem that after a while the buttons disappear from the screen en become empty ( menu , pbook etc ). When we turn off the phone and turn the phone back on the buttons re-appear. Does anyone have any idea what can cause this problem ?

Kind regards,

Stefan Lunenborg

I have this problem too.
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