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<html><head><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><meta name="GENERATOR" content="Microsoft FrontPage 3.0"><title>AT Command Manual (Voice Commands) for Rockwell based voice modem models</title></head><body><pre>This document describes how to program using ROCKWELL's Voice/Fax/Datachipset. The Zoltrix 14,400bps Fax/14,400 Modem with voice uses this chipset.This document was converted to text using BitFax Pro's OCR capabilities. Thedocument this information came from is as follows:ROCKWELL INTERNATIONALAT Command Reference Manualfor RC32ACW, RC32ACL, andRC96V24AC Modem FamiliesORDER NO. 833, Revision 1 July 2, 1993牋牋牋牋牋牋牋牋牋牋牋牋牋牋牋牋牋牋牋牋牋牋8. VOICE COMMANDSThe modem may be configured in response to AT voice commands to provide enhancedAdaptive Differential Pulse Code Modulation (ADPCM) coding and decoding for thecompression and decompression of digitized voice. ADPCM compression supports theefficient storage of voice messages, while optional coder silence deletion anddecoder silence interpolation significantly increase compression rates.The ADPCM Voice Mode Supports three sub modes once a voice connection isestablished (see #CLS command): Online Voice Command Mode, Voice Receive Mode,and Voice Transmit Mode.8.1. VOICE SUBMODES8.1.1. Online Voice Command ModeOnline Voice Command Mode is the default Voice sub mode entered when the #CLS=8command is issued, and may also be entered from Voice Receive Mode or VoiceTransmit Mode. Entry Into Online Voice Command Mode is indicated to the DTE viathe VCON message, after which AT commands can be entered without aborting thetelephone line connection.牋牋牋牋If the modem is the answerer, it enters Online Voice Command Mode immediatelyafter going off-hook, and can report instances of DTMF tones and calling tonesto the DTE. If the modem is the originator, it enters Online Voice Command Modebased on detection of the ringback cadence going away, upon expiration at theringback never came timer, or upon detection of answer tone, and the modem canreport DTMF tones, answer tones, busy tone, and dial tone to the DTE.(Note that DTMF tone reporting is supported in this mode if DTMF reporting isenabled via the #VTD command.)When this mode is entered as a result of going off-hook with the D or A command,VCON is always sent to the DTE, after which the modem accepts commands. If thismode is entered from Voice Transmit Mode, the DTE has issued the <DLE><ETX>,and the modem responds with VCON. If this mode is entered from the Voice ReceiveMode because of a key abort, the modem issues the <DLE><ETX> followed by VCON.If the #VLS command has switched in a handset or other device in place of thetelephone line, Online Voice Command Mode is immediately entered, whereas ifthe telephone line is selected, a physical connection with another stationmust occur before entering this mode.8.1.2. Voice Receive ModeVoice Receive Mode is entered when the DTE issues the #VRX command because itwants to receive voice data. This typically occurs when either recording agreeting message, or when recording voice messages from a remote station.In Voice Receive Mode, voice samples from the modem analog-to-digital converter(ADC) are sent to the ADPCM codec for compression, and can then be read by thehost. AT commands control the codec bits-per-sample rate and select (optional)silence deletion including adjustment at the silence detection period.In this mode, the modem detects and reports DTMF, dial tone, busy tone cadence,and inactivity (periods of silence) as enabled by the #VTD and #VSS commands,respectively. The modem can exit the Voice Receive Mode only via a DTE Key Abort,or via Deadman Timer expiration (S30).8.1.3. Voice Transmit ModeVoice Transmit Mode is entered when the DTE issues the #VTX command because itwants to transmit voice data. In this mode, the modem continues to detect andreport DTMF and calling tones if enabled by the #VTD command. This mode istypically used when playing back greeting messages or previouslyreceived/recorded messages.In this mode, voice decompression is provided by the codec, and decompresseddata is reconstituted into analog voice by the DAC at the original voicecompression quantization sample-per-bits rate. Optional silence interpolationis enabled if silence deletion was selected for voice compression.8.2. VOICE CAPABILITIES8.2.1. Call establishment - OriginateDirected Originate (Dial as a specific modem type)For most call originations, it is known ahead of time what type of call is beingattempted, and it is acceptable to disconnect if the remote side of theconnection does not cooperate. In this case, the modem can be configured aheadof time with the existing +FCLASS (and +FAA) or the #CLS command to be a data,fax, or voice modem. For Data and Fax Modes, the modem subsequently eithersucceeds with the desired type of connection, or eventually hangs up. For theVoice Mode, the DTE has the option of hanging up if there are indications thatthe remote station has not answered in voice, thus implementing a directedoriginate for voice. The following are the three connection type choices:VOICEThe modem dials and reports call progress to the DTE, which reduces toreporting NO DIALTONE, or BUSY.The modem allows the DTE to program a time period, which if elapsed after anyringback is detected, forces the modem to assume the remote has gone off-hook.A secondary time period (safety valve) can define a maximum elapsed time afterdialing for receiving no ringback before the modem assumes that the remote hasgone off-hook. This safety valve is devised in case the remote picks up thetelephone before any ringback is generated, and no other tones are detected.In this mode, the modem is attempting to make a voice connection only andtherefore, while waiting for ringback to disappear, it is also feasible todisconnect upon detection something which is definitely not Voice from theremote, such as any answer tone. The modem⌨️ 快捷键说明
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