This is coming in on a PBX, and is transferred to uninformed extensions. Phone rings and when you answer it you get a swift beep (off-hook warning). It is coming from a NYS-owned switch on Pearl Street surrounded by Albany NY. They can't trace it. It's driving us nuts.
Answers: This is a long shot, but is it possible your PBX is actually cause the problem? Are you sure the off-hook is coming from the calling number, or is it possible it is your own PBX malfunctioning?
For example, could your PBX not be detecting extension hang-ups properly and generating the off-hook response itself? Then when someone rings an extension near hang-up detection problems, you pick it up only to hear your own off-hook response from the second call hang-up?
Perhaps a long shot, but worth verify...
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