As a side note to this, having done phone/PBX work in the past, one thing we always had to do, espeically with VoIP, was test 911 connectivity. So, we'd set the system up, then call 911 and explain to them that we were setting up a new phone system and testing it's 911 capabilities. If we just dialed 911 and hung up, I'm sure we'd have made many clients unhappy.
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