Hoping some telco person can give me heads up. I receive lots of phone calls and when I answer it, there is nobody there and then after about 10-15 seconds in gives me the hang up signal.

This happens quite a bit, I really notice it on Saturday afternoons when I'm home.

My phone is with Primus, so I'm guessing they wont be able to do anything about it as they dont own the line. Telstra do....

Any suggestions ?