Sony Ericsson Dialog 4223 - Manual (Page 96)

Settings
BusinessPhone – Dialog 4223 Professional / Dialog 3213 96
Settings
If you require frequent use of certain functions, you may program
them on the Dual-Function keys on the telephone and the key
panel.
When you want to use the function, just press the key.
Notes: The Dual-Function keys allow programmed
functions and short numbers to be combined on the same
keys.
Remove the transparent cover in order to write the name
beside the key. Put the name referring to the programmed
function in the field above the line to indicate that it is the
primary function. If a function is already programmed on the
key, this will be displayed when you start programming.
Programming of Dial-by-Name keys and Individual
Abbreviated Numbers are described in section Abbreviated
Numbers and how to program a new diversion address is
described in section Call Forwarding.