Snom 220 - Manual (Page 17)

Basic Functions
Input Modes
Dependent on the context, various types of inputs are possible. The
active input mode is indicated in the bottom right-hand corner of the
display:
123 Only digits can be entered.
ABC Upper case mode. Press * to activate lower
case mode.
abc Lower case mode. Press * to activate upper
case mode.
Key mapping for input:
Moves the cursor to the left.
Moves the cursor to the right.
Deletes the character to the left of the
cursor.
Changes input mode to numbers.
Changes input mode to capital letters.
Changes input mode to small letters.
As mentioned in the table above, you use
, or to change
the input mode. After using a specific input mode for dialing a number,
the phone saves this mode as default for future use. If you want to use
a different mode, begin dialing and, if the mode is wrong, choose your
preferred mode and continue dialing.
Dialing a phone number
A telephone number is dialed with the numeric keypad.
If block dial, the default setting, is on and the user has not pressed any
keys for a few seconds, the phone will remind the user to press ENTER
in order to start the call.