This is excellent advice. Thank you so much!!!
I too suspect the FXS/FSO as the malicious point of entry. I'm usually the last one to leave (have been turning off the KSU when I leave until we plug this hole). Right before I left, the FXS/FSO extension lit up and grabbed an outside line...
Sorry about that omitted details - am located in Bloomington, IN. Here's the rest of the story ...
We've had our Vodavi 3501-01 running without hiccups since installation in 2008. We use it with a single voicemail account (like an answer maching), because I hate voicemail. We have 1 remote...
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