2wire (1000-400108-001) Router "crackling phone lines" Questions

crackly phone line phone crackles when i m connected this may mean that your line has a fault, or if ADSL line is used, try changing the line filter.

...phone as the crackling is so bad i can't hear who ever is on other end BT have checked line and box in house no fault found also contacted AOL and they said if i used extention cable this would be ...

...filter on the main phone socket?Usually they provide 2 filters with routers. when you pick up the phone can you hear crackling if you can it's the filter.Bad connections on plugs.cable short or