Having a weird problem, I have a MKII BeoLine base station with a couple of 6000 handsets. Suddenly, out of the blue, we started getting very very bad echoing on the line and when dialing numbers sometimes they are not recognised?

Have changed the ADSL filter and also the BeoLine, but still suffering the same problems.(Although Panasonic cordless works fine?)

Have BT changed the goalposts?