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AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual
Conexant 102184B
5-4
5.2 Voice Commands
5.2.1 Configuration Commands
+FCLASS=8 - Select Voice Mode
+FCLASS=8 selects the Voice Mode. The Voice Mode commands and responses
described in this section are applicable when command +FCLASS=8. (See Section 3.2.1
for the definition of the FCLASS command.)
+VNH - Automatic Hang-up Control
This command enables or disables automatic hangups.
Syntax
+VNH=<hook>
Defined Values
<hook> Decimal number corresponding to the selected option (see
Table 5-4).
0 The modem enables automatic hangups as is
normal in other modes.
1 The modem disables automatic hangups usually
found in the other non-Voice Modes.
2 The modem disables automatic hangups in the
other non-Voice Modes. The modem performs
only a “logical” hangup (returns to OK result
code).
Table 5-4. +VNH Command Behavior
Command Response
Command No Carrier
Present
ATH ATZ DTR & D2
+VNH=0 Y Y Y Y
+VNH=1 N Y Y Y
+VNH=2 N N N Y
Notes:
Y= will hang-up; N= will not hang-up.
How +VNH is reset:
DTE uses +VNH command to change setting.
DTE issues another +FCLASS mode change without issuing another +VNH.
A hang-up event occurs (see this table).
DTE issues +VIP command.
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