Specifications
Chapter 4 – Voice Commands 
Multi-Tech Systems, Inc. SocketModem MT5600SMI/MT5656SMI Reference Guide (S000306B)  97 
Chapter 4 – Voice Commands 
Voice Commands Overview 
Voice commands are identified in Table 4-1. 
Table 4-1. Voice Commands 
Command  Function 
Configuration 
+FCLASS  Set Mode 
+VCID  Caller ID (CID) 
+VNH  Automatic Hang-up control 
+FMI? Manufacturer Identification 
+FMM? Product Identification 
+FMR?  Version, Revision, etc. 
+FLO Flow Control 
Voice 
+VIP  Voice Initialize All Parameters 
+VRX  Start modem Receive (Record) 
+VTS  Voice Tone Send (Send single frequency or DTMF) 
+VTX  Start modem Transmit (Playback) 
+VGR  Voice Gain Receive (Record Gain) 
+VGT  Voice Gain Transmit (Playback Volume) 
+VIT  Voice Inactivity Timer (DTE/Modem) 
+VLS Analog Source/Destination Selection 
+VRA  Ringback Goes Away Timer 
+VRN  Ringback Never Appeared Timer 
+VSD  Silence Detection (QUIET & SILENCE) 
+VSM  Compression Method Selection 
+VTD  Beep Tone Duration Timer 
+VDR Distinctive Ring 
+VDT  Control Tone Cadence Reporting 
+VPR  Select DTE/modem Interface Rate (Turn off autobaud) 










