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Chapter 6 – Voice Commands
SocketModem Global MT5634SMI Developer’s Guide 45
Voice S-Register Summary
Voice mode S-Register changes are outlined below.
S-Register Description
S0 Automatic answer is disallowed in Voice mode.
S7 Wait for Carrier After Dial. Default is 60 seconds. In Voice mode, S7 contains the maximum
amount of time that the modem will wait during Call Origination, all the time detecting for ring
backs, before assuming that the remote station will not go off hook.
S10 Automatic disconnect is disallowed in Voice mode.
Voice Commands
The +V Voice enhancements are implemented with AT+V (for Voice) commands, as well as changes to several
existing commands.
In general, the modem does not accept Data mode (+FCLASS=0) commands or Fax mode (+FCLASS=1, 2, 2.0)
commands when in Voice mode (+FCLASS=8).
Commands That Change for Voice Mode Support
Command Description
A Disallowed in Voice mode.
D Causes the modem to Dial assuming +VLS=2 if +VLS=0 when the ATD command was
entered.
H Values greater than 0 disallowed in Voice mode.
I Disallowed in Voice mode.
L Disallowed in Voice mode.
M Disallowed in Voice mode.
O Disallowed in Voice mode.
Q Disallowed in Voice mode.
X Disallowed in Voice mode.
Z Reset modem.
&D &D1 is disallowed in Voice mode.
+FCLASS=8 Places the modem in Voice mode.
+FCLASS= New values are added for Voice mode.
+FCLASS=? New values are added for Voice mode.