BT BT3550 User Manual page 44

Your caller cannot hear you
Check to see if the display says
•
Press the right soft key
Incoming caller's number is not displayed even though you have Caller Display
The caller has to allow their number to be sent. The number could be withheld or is unavailable.
•
If you need some help, call us on 0800 218 2182* or go to bt.com/producthelp
. If so, the secrecy feature is switched on.
MUTE ON
to speak to your caller again.
44