Multi Tech Equipment ISIHI-2S 用户手册
MultiModemISI Hybrid Series, ISIHI-2S
151
Appendix
The extended DTMF characters (A, B, C, D) are the high-end frequencies (1633 Hz)
defined on some telephone sets with a fourth vertical column of buttons. This fourth
column provides for extended PBX control functions. The actual functions that are
provided depend on the PBX manufacturer’s implementation and feature set.
defined on some telephone sets with a fourth vertical column of buttons. This fourth
column provides for extended PBX control functions. The actual functions that are
provided depend on the PBX manufacturer’s implementation and feature set.
Hz
Digits
697
770
852
941
Hz
1209
1336
1477
1633
1
2
3
A
4
5
6
B
7
8
9
C
0
#
D
*