If you experience any problems, please visit 
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Is the line cord plugged into the phone socket and the other end plugged into the telephone wall socket correctly?
Check the dialling mode switch is set to the correct position. Page 7.
Is the ringer volume set to Off? Page 19.
You may have too many phones, fax machines and/or answering machines plugged in which might be overloading 
the sockets. See Technical Information, page 31.