“I believe the phone has no internal battery backup. Will the stored speed dial and other data be saved if the phone is disconnected simultaneously from both the telephone line and power adapter, and for how long? IE: non-volatile vs volatile memory?”
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Hi. We bought this phone about a month ago. But we don’t use the memory functions in our office. So I don’t know the answer to your question. Here is a link to the manual: https://att.vtp-media.com/products/ML/ML179XX/ML17929_CIB_i6.0_20170105.pdf
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