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Make sure your telephone volume is not off, low or muted.
If you're using a cordless telephone, check that the batteries are charged.
Also check your telephone's connection to it's base station. Ensure the base station is connected correctly to the telephone line.
If you're using a cordless telephone. Try another handset (preferably wired) and see if this works.
If you haven't already, test your telephone from the Master Test Socket.
You can find a video on how to do this here.
If the above steps do not resolve the problem, please contact our Technical Support team for further assistance.