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Another possibility is an MTU on the line. An MTU, is a Maintenance Test Unit. In days long gone, it was used to remotely check for problems on your phoneline. It seems these lovely units that consist of an Op-Amp and a bunch or resisters, capacitors, etc ... cause major problems with DSL. These are generally located in your phone closet or basement (where the phoneline comes from the street into your house/apartment).
You can have your phone company do a line check and they should be able to determine if you have one on your line and approximately where it is located.
Some other possibilities suggested by our members:
1. If a customer's DSL goes out when they answer an incoming telephone call, it's not always in the house wiring. Have your local phone company check the CO for what we call a half tap. If they find one that should solve your problem.
2. If the water company's automatic reading unit in your basement is connected to your telephone line, it may be causing issues. Unplug the phone line attached to it and you can see if this is the case. They may contact you advising they can't read your water meter. You can advise them it is causing issues with your DSL and they will hopefully address the problem.
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