Multi-Tech Systems MT2456SMI22 manual 22bis Call Control Commands, Dial Modifiers

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Chapter 4 - V.22bis Commands

V.22bis Call Control Commands

D Dial

This command directs the modem to go on-line, dial according to the string entered and attempt to establish a connection. If no dial string is supplied, the modem will go on-line and attempt the handshake in originate mode. Note: If the ATD command is issued before the S1 register has cleared, the modem will respond with the NO CARRIER result code.

The modem will behave as a data modem and will attempt to connect to another data modem. The modem will have up to the period of time specified by register S6 or S7 to wait for carrier and complete the handshake. If this time expires before the modem can complete the handshake, the modem will go on-hook with the NO CARRIER response.

This command will be aborted while in progress (but before the completion of the handshake) upon receipt of any DTE character.

Dial Modifiers

The valid dial string parameters are described below. Punctuation characters may be used for clarity, with parentheses, hyphen, and spaces being ignored.

Syntax D<string>

Defined Values

<string> Character string corresponding to the selected option(s). 0-9 DTMF digits 0 to 9.

*The 'star' digit (tone dialing only).

# The 'gate' digit (tone dialing only).

A-D DTMF digits A, B, C, and D. Some countries may prohibit sending of these digits during dialing.

L The modem will re-dial the last valid telephone number. The L must be immediately after the D with all the following characters ignored.

P Pulse dial the numbers that follow until a "T" is encountered. Affects current and subsequent dialing. Some countries prevent changing dialing modes after the first digit is dialed.

T Tone dial the numbers that follow until a "P" is encountered. Affects current and subsequent dialing. Some countries prevent changing dialing modes after the first digit is dialed.

R This command will be accepted, but not acted on.

! Flash. the modem will go on-hook for a time defined by the value of S29. Country requirements may limit the time imposed.

W The modem will wait for dial tone before dialing the digits following "W". If dial tone is not detected within the time specified by S7 (U.S.) or S6 (other countries), the modem will abort the rest of the sequence, return on-hook, and generate an error message.

@ The modem will wait for at least 5 seconds of silence in the call progress frequency band before continuing with the next dial string parameter. If the modem does not detect these 5 seconds of silence before the expiration of the call abort timer (S7), the modem will terminate the call attempt with a NO ANSWER message. If busy detection is enabled, the modem may terminate the call with the BUSY result code. If answer tone arrives during execution of this parameter, the modem handshakes.

& Wait for credit card dialing tone before continuing with the dial string. If the tone is not detected within the time specified by S7 (U.S. models) or S6 (other countries), the modem will abort the rest of the sequence, return on- hook, and generate an error message.

, The modem will pause for a time specified by S8 before dialing the digits following ",".

; Return to command state. Added to the end of a dial string, this causes the modem to return to the command state after it processes the portion of the dial string preceding the ";". This allows the user to issue additional AT commands while remaining off-hook. The additional AT commands may be placed in the original command line following the ";" and/or may be entered on subsequent command lines. The modem will enter call progress only after an additional dial command is issued without the ";" terminator. Use "H" to abort the dial in progress, and go back on-hook.

^ Toggles calling tone enable/disable; applicable to current dial attempt only.

( ) Ignored; may be used to format the dial string.

-Ignored; may be used to format the dial string. <space> Ignored; may be used to format the dial string. <i> Invalid character; will be ignored.

> If enabled by country specific parameter, the modem will generate a grounding pulse on the EARTH relay output.

Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide

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Contents SocketModem Country By Email By Phone PN S000281A, Version aContents Product Description Product Description SpecificationsSpeed Conversion Technical SpecificationsMaximum Component Height Physical DimensionsPin Descriptions Pin Configurations3V DC Power 3V and 5V Serial SocketModem Handling PrecautionsInput High Input Low Outputs Output High Output LowDTE/DCE Commands Generic Modem Control CommandsCall Control Commands Modulation Control CommandsSynchronous Access Mode Commands Error Control and Data Compression CommandsFast Connect Command Line Side Device CommandsSoft Reset and Restore Profile 22bis Generic Modem Control CommandsOperating Mode +VCID Caller ID CIDIdentification +GCI Country of InstallationProcedure Restore Factory Configuration ProfileLocal Analog Loopback Test Load to Internal RAMCommand Echo 22bis DTE/DCE-Modem Interface commandsQuiet Result Codes Control Result Code FormExtended Result Codes Connect Ring No Carrier Error No Dial Tone Busy No AnswerRlsd Option Short Form Long Form Value in ATXn CommandResult Codes OK 0 or DTR OptionRTS/CTS Option \G Modem-to-Modem Flow Control XON/XOFF+IFC DTE-Modem Local Flow Control +IBC In Band Commands Entering and Exiting In Band Active StateEM Shielding Data Command Hex Codes Description Supported DTE-to-DCE Commands Supported DCE-to-DTE CommandsBand Processing of AT Commands 22bis Call Control Commands DialDial Modifiers Result Code Set Pulse Dial Default Set Tone Dial DefaultReturn to On-Line Data Mode Speaker VolumeMSpeaker Control Display Current Configuration and Stored ProfilesSelect Guard Tone Select Pulse Dial Make/Break RatioReport Line Signal Level \V Single Line Connect Message EnableReport Line Signal Quality Display Blacklisted NumbersNO. Phone Number -DELAY Display Delayed NumbersBehavior in Data Mode Syntax *D Example+PCW Call Waiting Enable Reporting Selected Values+VDR Distinctive Ring Table of +MS Command Supported Rates 22bis Modulation Control Commands+MS Modulation Selection SyntaxITU-T or Bell Enable/Disable Line Quality Monitor and Auto-Retrain+ESR Selective Repeat 22bis Error Control and Data Compression Commands+ETBM Call Termination Buffer Management \B Transmit Break to RemoteBreak Control Result Codes OK 0 to 5 Error Otherwise+ESA Configure Synchronous Access Submode 22bis Synchronous Access Mode CommandsReporting Selected Options +ESA?+ITF? Transmit Flow Control Thresholds22bis FastConnect Command $F Fast Connect ControlSyntax $Fn Defined Values Threshold Adjustments for Telephony Extension 22bis Line Side Device CommandsTRV Tip and Ring Voltage Measurement ResponseRead/Write S-Parameter 22bis S-ParametersSummary of S-Parameter Defaults Register Function Range/Units DefaultAscii S1 Ring Counter S0 Number of Rings to Auto-AnswerS2 Escape Character S3 Carriage Return CharacterS10 Lost Carrier To Hang Up Delay S8 Pause Time For Dial DelayS12 Escape Prompt Delay EPD S9 Carrier Detect Response TimeS19 Reserved S16 Test Mode Bit Mapped Options StatusS20 Reserved S21 V.24/General Bit Mapped Options StatusS25 Delay To DTR Off S24 Sleep Inactivity TimerS26 RTS to CTS Delay S22 Speaker/Results Bit Mapped Options StatusS27 Bit Mapped Options Status S30 Disconnect Inactivity TimerS28 Bit Mapped Options Status S29 Flash Dial Modifier TimeS36 Lapm Failure Control S38 Delay Before Forced Hang UpS37 Desired Line Connection Speed S39 Flow Control Bit Mapped Options StatusS48 V.42 Negotiation Action S41 General Bit Mapped Options StatusS82 Break Handling Options S86 Call Failure Reason CodeS95 Extended Result Codes Control S91 Pstn Transmit Attenuation LevelTable of Result Code Definitions 22bis Result CodesCode Message Meaning Connect75TX/1200RX Is enabled Figure A-1. Serial Test/Demo Board Block Diagram Block DiagramCountry Certifications Product Safety and EMC ApprovalsCountry Country Code More plannedHardware Considerations Regulatory Design ConsiderationsSafety Qty Name Description SocketModem PlacementCompliance Multi-Tech Systems, Inc. ComplianceTelecom Requirements for the United States Label Physical Characteristics Label Content and FormatTelecommunications Regulations for Canada Labeling Continuity and ChangesOther Label Requirements Industry Canada New Zealand Telecom Warning NoticeEMC, Safety, and R&TTE Directive Compliance International Modem RestrictionsSouth African Statement Index Index
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