This is indeed Charter Communications. When connected, there is supposed to be an automated message explaining that a service call has been scheduled and you are to press "one" to confirm the appointment. I got three of these "blank" calls via my cell phone today with disconnects at 4 secs instead of a message. I reported the problem and hopefully, it can be repaired as unconfirmed appointments are cancelled.
I just got a call from 203-304-8705 (Conneticut) on my cell phone asking me to sign up for Digital. I am so sick of getting solicitation from Charter. So I called their support number (1-888-438-2427) bitched the poor gal out (almost feel bad about it). Found out I'm on the "do not mail list" since I called earlier about getting junk mail every two days from them. Had them add me to the "do not call list". The gal then still and the audacity to try and sell me on other Charter services. Argh!!!!