try quiet line test dial 17070 option 2 should hear nothing and best with corded phone if cordless dull hum normal
is there is noise hiss/crackle/static then your need to phone 151 and report a phone fault NOT a broadband fault. get rid of noise and improve your broadband conenction
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Check for faulty/missing ADSL filter(s). The function of the ADSL filter is to separate the broadband digital signal from the telephone baseband analogue signal. A missing or faulty filter will cause interaction between the two services leading to a noisy analogue signal and an unreliable broadband signal that drops out every time a phone rings or a receiver lifted. EVERY analogue device plugged into a standard telephone socket (fax, telephone, alarm systems etc), MUST have a filter fitted unless the master socket is of a type with a built in filter.
Your HH then plugs into the ADSL output of one of the filters.