A few months ago, for several days, I got this message on my land-line phone when I tried to call my dermatologist. I could call anyone else successfully, but not that doctor's office. Eventually, the problem went away. Today, I've been getting the same message when I call my father. In both cases, the problem was intermittent. After a few hours of unsuccessful calls, the call went through. So, I was finally able to speak with my Dad.
What is going on, and how can we fix it?
By the way, I saw a really old post on this topic, and the (useless) response was to use 10-digit dialing. In both cases where this occurred, I of course was using 10 digits.
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