I called Ooma customer support, but the results were very disappointing. I feel that the rep basically made up a bogus theory on the spot just to get me off the line. The theory was that, because my Ooma number is a ported number and the caller is a customer of my previous provider, Qwest, this is a Qwest problem. However, most of my callers are Qwest callers and no other caller is having this same problem. And, it doesn't really explain why she had no problems calling me for 6 months after my number was ported. Furthermore, if it were a Qwest problem, her calls probably wouldn't go through at all, but they are making it through to my Ooma voicemail. The customer support rep promised to call Qwest and ask them to make sure my number was completely cleared from their system and call back by the end of the day and give me a report. He never called back and the problem still persists.