Why do you have compromised phone lines on your security system? Don't know the details of your house but I'd make those phone lines invisible first. Maybe encased in rigid metal conduit that enters through the basement or other means that is not exposed and also not even visible from the exterior? How about a cellular backup? I've done security systems for LEO's that were always concerned about BG's coming after their families and can tell you there are many ways to make your system not only well secured from the planning BG but also keep the signs to let the less determined crooks know to stay away too.