I have a loud buzzing on my home phone land line. I have gone to the CSU Box on the exterior of my home and connected a phone directly to to the CSU Line - No Buzzing Is Heard! I have ran a new phone line from the CSU Box into the home. The DSL Line is working - a little slower than usual - but.. The buzziing is still on the line. What is the issue and what can I do to get the buzzing to stop?

Sounds like one of your conductors may be touching a ground?
Any recent Construction?