Better yet just find your interface. On an older house it will just be a terminal block with brass nuts wherever the phone line enters the house. On a newer house or one that has had the phone service replaced by the phone co. recently, it will be a grey plastic box outside the house with a modular plug inside. Once you've found it, disconnect all the field wiring in your house leaving only the service wire connected. With the newer style grey plastic box that's done by just pulling the modular connector out of its socket. You'll need a nutdriver or socket to do it on the older style terminal block.
Once you've done that, take a known good working phone, and either plug it in (to the new box) or take a short length of phone wire and a new jack and connect it directly to the terminal block (old style.) If you still have static, then call the phone company and tell them that you've determined that it is definitely their problem and that you expect them to fix it.
If you have Verizon, don't expect results however. I did this dance for about 6 mos. and many service calls at my old place before I just gave up and went all cellular. Those annoying radio/TV adds bragging on their reliability make me mad all over again, they're the most worthless, unreliable utility I've ever dealt with. (I had problems with them at two other places I've lived, as well.)
nate