I doubt it is RF interference between your ADSL wireless router and the
cordless phone.
Your ADSL filter may be faulty.
It appears you have hit the nail on the head.
Have a corded phone on the kitchen wall, on an ADSL2+
wall phone filter. (F2932) DSE
Removed phone off wall, noise still there.
Removed filter off the wall, appears to have fixed problem
If you have a security system you should have an ADSL central splitter
installed somewhere in your telephone line.
Have a security system which normally just dials me, why not just
plain adsl filter instead of central filter.
If no security system then there should be an ADSL in-line filter installed
between the telephone line input on you cordless base station.
Sometimes these filters can go faulty but doesn't stop either the phone or
ADSL from working.
The kitchen phone is where the line comes in off the street.
From there it goes to where the PC is located along with wireless
router and alarm. Have a 3 socket plate on wall.
One for the router, one for alarm (if used) and
one for phone lead from PC which I use for faxing.
Line continues and ends at Main bedroom where cordless base is
located. Is it too complicated?
In some cases, one filter isn't enough to eliminate the ADSL signal from
making it into the cordless phone's base station. Try cascading 2 filters.
Also some filters don't work properly if connected the wrong way round.
Make sure the LINE side is connected to the telephone line and the PHONE
side connected to the cordless telephone bas station.
2 x filters @ around $25 to $30 each, soon adds up!
Thanks Alan for your help
Regards Ian