Earpiece volume Use Up / Down to adjust during a call. Mute Press C during a call
Keylock Hold # to toggle lock on and off
Memories. Storing a number Hold Menu (white circles button, left of R) "Phone Lst set" shows, Press OK, Use up / down to choose a location, enter phone number then press OK. Use C to clear the number if required.
Dialling from memory Press up / down till the number you want shows, then Green.
Caller Id Hold Menu, use down key till "CLD", OK, Use up / down key to view the list and green to return a call.
Handset Ringer Hold Menu, scroll to "Settings", OK, "Handset", OK, Scroll to "Bell", OK then choose loudness etc then OK.
Registering handsets. See www.htelephones.co.uk/dect/doroadd.htm for specific details
Hold the base page button for 30 seconds. Hold Menu, scroll to "Settings", OK, "Handset", OK, Scroll to "register", OK, Press 1 then 0000 or the relevant pin for your base then OK.