welcome to the BT community forum where customers help customers and only BT employees are the forum mods
I moved your post to start your own subject to avoid confusing replies with the other post originator
in order for the forum members to help please can you post the adsl stats from your router (unlessHH4/5) may need to 'show detail' to get all stats (if hub enter 192.168.1.254 in your browser and navigate to adsl or use a-z, if netgear enter 192.168.0.1) and run btspeedtester (MAC users may have problems). when first test completes then run diagnostic test and post the results .
are you connected directly via a filter to the NTE5 master or test socket or to somewhere else? Is the master the only phone socket in your home?
Have you tried the quiet line test? - dial 17070 option 2 - should hear nothing - best done with a corded phone. if cordless phone you may hear a 'dull hum' which is normal
Someone may then be able to offer help/assistance/suggestions to your problem
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Have you tried the quiet line test dial 17070 option 2 if any noise is heard this needs reporting to BT Faults on 151 with no mention of broadband in the call once resolved your broadband will start to improve