User Guide

Chapter 4 – Voice Commands
Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C) 104
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.