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Voice capability stands for the modem's ability to digitizalize incoming voice messages,
which the computer stores and forwards. Only a limited voice function that supports DTMF
(Dual Tone Multi Frequency) detection and generation is provided by U-90E modem.
12.1 The voice AT command specification
The following is a summary of the supported
Command
Function
+FCLASS
Voice/data/fax selection 0,1,2.0,8
+FMI
Manufacturer ID.
+FMM?
Model ID
+FMR?
Revision
+VLS
Select a voice I/O
device.
Special Functions
AT
commands:
Table 12-1 Voice AT Commands
Option
Default
0
N/A
U90E
N/A
ZyXEL
N/A
V1.x
0,1,2,8,16
0
U-90E Data/Fax Modem
Chapter 12
Voice Capability
Description
0: DATA.
1: CLASS 1 FAX.
2.0: CLASS 2.0 FAX.
8: VOICE.
0: The DCE is on hook. Local phone
connected to Telco line.
2: The DCE is off-hook and is connected
to the Telco line. The local phone is
12-1
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