Keypad

Did you mean:

• Matrix Keypad
• Coinvox 22 keypad

ITU-T E.161 recommendation that can be used for phoneword (naambellen) and T9 (predictive text):

1
 

2
abc

3
def

A
FO

4
ghi

5
jkl

6
mno

B
F

7
pqrs

8
tuv

9
wxyz

C
I

*
+

0
␣

#
⇫

D
P

• FO: Flash override (AUTOVON)
• F: Flash (AUTOVON)
• I: Immediate (AUTOVON)
• P: Priority (AUTOVON)
• KP: Key Pulse (MF, R1)
• ST: Start (MF, R1)

• DTMF (Dual Tone Multi Frequency, a.k.a. Touch-Tone) is standardized in the ITU-T Recommendation as Q.23, and is also known in the UK as MF4 [1]
• AUTOVON (military designation 490-L) [2]
• MF (Multi Frequency signaling, a.k.a. R1) [3]

Also see [4]