Siemens HIPATH 8000 - Manual (Page 28)

Using the optiPoint 410/420 family S V7.0
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Dialling Keypad
The dialling keypad of the advance is labeled with digits, letters and some
special characters. You can key in letters and special characters in the cor-
responding input mode by pressing the corresponding key as often as is
necessary until the required letter or the required special character appears
on the display.
For example, if you want to enter the letter "R", press the key "7" three
times as "R" is at the third position. For the letter "U", press the key "8"
twice.
More information about text editors see Æ page 155.