‘Direct Dial Inward’ is an extension on an ISDN system. These are physical lines internally after the main socket.
‘Estimated Response Time’ is when Openreach schedule to attend a site to attempt to clear a fault.
‘Network Termination Equipment’ is fitted by Openreach for analogue (PSTN) lines and is the demarcation point. This is typically a white "telephone" socket on the wall.
‘Distribution Point’ is the point at which single telephone lines are taken from a bundle to a premise.