Really bad crackling sound on certain calls
if only happens on certain calls it could either be the handset itself, a week point on all corded phones is the cable between the handset and the body of the phone. whilst talking to someone on a call wiggle the cord where it enters the handset, does it crackle if not do the same where the cord enters the phone body, if no crackle likely not phone.
next select a line if you have more than 1 line note which 1 and dial 17070. this will BT autotest the line. if more than 1 line on system do same for all lines. check with your system admin if there are quick codes to select individual lines, eg dial 9 for any line or 81 for line 1 82 for line 2 etc .
if you get crackle still on 1 of the lines get your maintainer to check the lione at the cable head where lines enter building
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