Index
Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273G) 52
3
32-bit Frame Check Sequence – +EFCS 21
A
Analog Source/Destination Selection – +VLS 32
Answer – A 5
AT Commands
#CBNn – Store Callback Number 19
#CBPn – Store Callback Password 19
#DBn – Callback Enable/Disable 19
$Cn – Key Abort 15
$Dn – DTR Dialing 15
$SBn – Serial Port Baud Rate 15
%Cn – Data Compression Control 11
%En – Line Quality Monitor 12
%L – Line Signal Level 12
%Q – Line Signal Quality 12
%U – PCM Code Selection 12
&Cn – Data Carrier Detect (DCD) Control 8
&Dn – Data Terminal Ready (DTR) Control 8
&En – Modem-Initiated Flow Control 9
&En – V.42 Error Correction Modes 8
&En – V.42bis Data Compression 9
&Fn – Load Factory Settings 9
&Gn – V.22bis Guard Tone Control 9
&Kn – Flow Control Selection 9
&Mn – Communications Mode 9
&Pn – Make/Break Dial Ratio 10
&Qn – Sync/Async Mode 10
&Rn – Clear to Send (CTS) Control 10
&Sn – Data Set Ready (DSR) Control 10
&Tn – Local Analog Loopback Test 10
&Tn – V.54 Test Command 27
&Vn – Display Current Configuration and Statistics
for Last Connection 10
&Wn – Store Current Configuration 11
&Xn – Synchronous Clock Source 11
&Yn – Select Profile for Hard Reset 11
&Z3 – Leased-Line Dial Back-up Number Storage
11
&Zn – Store Telephone Number 11
** – Flash Memory Download 15
*B – View Numbers in Blacklist 15
*D – View Delayed Numbers 15
*E – Escape Remote Configuration 16
+++ – Escape Sequence 16
+A8E – V.8 and V.8bis Operation Controls 40
+A8I – CI Signal Indication 40
+DR – Data Compression Reporting 20
+DS – Data Compression 20
+DS44 – V.44 Compression Select 20
+EB – Break Handling in Error Control Operation 21
+EFCS – 32-bit Frame Check Sequence 21
+ER – Error Control Reporting 21
+ESR – Selective Reject 22
+ETBM – Call Termination Buffer Management 22
+FCLASS= – Set Current Fax Class 13
+FCLASS=8 – Select Voice Mode 28
+FLO – Flow Control 29
+GCI – Country/Region of Installation 14
+IFC – DTE-Modem Local Flow Control 23
+ILRR – DTE-Modem Local Rate Reporting 23
+IPR – Fixed DTE Rate 24
+MR – Modulation Reporting Control 24
+MS= – Modulation Selection 14
+PCW=n – Call Waiting Enable 17
+PIG=n – PCM Upstream Ignore 17
+PQC=n – Quick Connect Control 17
+PSS – Use Short Sequence 17
+VCID=n – Caller ID Selection 19
+VDR – Distinctive Ring 35
+VDT – Control Tone Cadence Reporting 35
+VGM – Microphone Gain 37
+VGR – Voice Gain Receive (Record Gain) 31
+VGS – Speaker Gain 37
+VGT – Voice Gain Transmit (Playback Volume) 31
+VIP – Voice Initialize All Parameters 30
+VIT – Voice Inactivity Timer (DTE/Modem) 32
+VLS – Analog Source/Destination Selection 32
+VNH – Automatic Hang-up Control 29
+VPR – Select DTE/Modem Interface Rate (Turn
Off Autobaud) 36
+VRA – Ringback Goes Away Timer 33
+VRID= – Caller ID Report Retrieved 19
+VRN – Ringback Never Appeared Timer 34
+VRX – Start Modem Receive 30
+VSD – Silence Detection (Quiet and Silence) 34
+VSM – Compression Method Selection 34
+VSP – Speakerphone ON/OFF 37
+VTD – Beep Tone Duration Timer 35
+VTS – Send Voice Tone(s) 30
+VTX – Start Modem Transmit (Playback) 31
A – Answer code 5
A/ – Repeat Last Command 5
\An – Maximum MNP Block Size 12
AT – Attention code 5
Bn – Communication Standard Setting 5
\Bn – Transmit Break 12
CIC – Connect Incoming Call 41
CRIs – Call Request Identification 41
CRNs – Call Request Number 41
CRSx – Call Request Address 41
DIC – Disregard Incoming Call 41
Ds – Dial 5
DS=n – Dial Stored Telephone Number 6
En – Echo Command Mode Characters 6
Hn – Hook Control 6
In – Information Request 6
\Kn – Break Control 13
-Kn – MNP Extended Services 15
L5 – Lists Current Operating Parameters 6
Mn – Monitor Speaker Mode 6
\Nn – Error Correction Mode Selection 13
On – Return Online to Data Mode 6
P – Pulse Dialing 6