try quiet line test dial 17070 option 2 should be silent and best with corded phone
can you post the stats from your router if hh5 then troubleshooting then helpdesk
enter your phone number and post results remember delete number https://www.btwholesale.com/includes/adsl/main.html
use this to post pics
Stats from router?
if hh6 then advanced settings then technical log information
if hh5 then troubleshooting then helpdesk