Router to socket is not very long. My main computer is ethernet, got a couple of other devices on wireless.

Tried changing filters. Phone is unplugged completely (who uses a fixed line these days? Just got it for the DSL).

ISP is supposed to be sending a technician sometime, awaiting his leisurely arrival (they haven't really made great advancements in customer service here).

Still working on previous suggestions, guess its gone til coming weekend.

Yep a nice leisurely life, nothing done in haste

How many phone sockets are attached to the phone line?

Just the one.

ISP is supposed to be sending a technician sometime, awaiting his leisurely arrival (they haven't really made great advancements in customer service here).

That sounds familiar, you don't have to go as far as Saudi to experience that