I have just purcahsed a WAG354G wireless router and when i connect it i cannot use my landline telephone and the line is busy. I have tested it with a usb modem and it works fine with that. but as soon as i connect the cable to my wireless router it stops working. I have a filter attached. I have a cordless phone. Has anyone else had this problem and what could be the solution? Any help will be gratefully appreciated. Thanks.