They keep trying to get through to us, but it never works. My guess is they're using a robo-dialer, and said dialer does not like the 'Out of Service (SIT) tone sequence our Asterisk system sends (same thing the old 'Telezapper' did) when it first answers. The dialer's probably hanging up on its own.
Some Googling turned up a possible lead on these slime-suckers at this link.
I have a call block capacity on my phone. Or, if you really want to be NICE...call them back after an hour or so, and give them your NEW number, which is the number to the local police department.
I'm getting a call from this Tech Support number several times a day for the last three days. No one there when I answer. When I call back, there's nothing. No ringtone or anything.
received 7 calls on 9.30.11 and 1 today so far. Even when you tell them that I am "do not call registry", the person at the other end become sarcastic.