Why can't I answer calls on the Doro Liberto 820 Mini?

when my phone rings
I press the red button which takes me to the
green phone if I want to answer or the orange/ red phone if I want to cancel call. but if i hit the green phone it will not let me answer the call, what am I doing wrong?????? can't seem to find anything on the net/manual.

thanks




I, too, am having this problem.  Any helpful suggestions gratefully appreciated



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