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ITU V.253:1998

ITU V.253:1998 Control Of Voice-related Functions In A Dce By An Asynchronous Dte Builds on and extends the Asynchronous DCE "AT" command set specified in Recommendation V.250. Covers a DCE command and response syntax for voice playback and record, for generation and detection of D

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Table of Contents

1Scope
2References
3Definitions
4Voicestatesandoperationofavoice-capableDCE
4.1Non-speakerphonesectionofavoiceDCE
4.1.1Voicestates
4.2.1Voicestates
5Voiceandnetworksignallingsupport
5.1Events(reportssenttotheDTE)
5.2Actions(commandssenttotheDCE)
5.3Calldiscrimination
5.3.1Descriptionanddefinitions
5.3.2Hookcontrolundervoice
5.4Timingmarksinthevoicedatastream
5.5Compressionmethodandavailabilityofevent
detection
6Operation
6.1Numericradix
6.2Formatconventions
6.2.1Numberingconventions
6.2.2Orderofbittransmission
6.2.3Codewordmappingconventions
6.3Commandstructure
6.3.1ATcommands
6.3.2Basiccommandsyntax
6.3.3Extendedcommandsyntax
6.3.4Issuingcommands
6.3.5Commandexecution
6.3.6DCEresponsesfromATcommands
6.3.7Datastreamtransparentcommands
6.4Sessionmanagement
6.4.1Scope
6.4.2Flowcontrol
6.4.3Serialdatainterchangecircuits
6.4.4DTE/DCEinterfaceratechanges
6.4.5DTE/DCEinactivitytimer
6.4.6DCEimplementationwithoutdatamodes
7Events(unsolicitedresultcodes)
7.1Formsoftheeventdetectionreport
7.1.1Simpleeventdetectionreport
7.1.2Complexeventdetectionreport
7.2Eventreportsrestrictions
7.3codessenttotheDCE
7.4Minimumeventreportingrequirements
7.5DTMFeventreportsequence
7.6RecordedDTMFtoneonplayback
7.7Silencedetectionduringvoicereceives
8Actions
8.1Simpleactioncommands
8.2Configurationsettingandinitiatingactioncommands
8.3codessenttotheDCE
8.3.1Adjustingthevolumeandgainlevelsby
codes
8.3.2Pauseandresumecommandsduringvoice
stateswithDTEtoDCEdatatransfers
9Supportcommands
9.1Actioncommands
9.1.1Dialcommandinvoice(with+FCLASS=8.0)
9.1.2Hangupcommandinvoice(with+CLASS=8)
9.1.3RepeatCallerID(+VRID)
9.2Configurationcomands
9.2.1Modeselection
9.2.2+FCLASS=?
9.2.3CallerIdservice
9.2.4DIDservice
9.2.5Automatichangupcontrol
9.3MiscellaneousATcommands
9.3.1S-parameters
9.3.2ATZ
10Voicecommands
10.1Actioncommands
10.1.1Initializevoiceparameters
10.1.2Ringlocalphone
10.1.3Voicereceivestate
10.1.4Voiceduplexstate
10.1.5DTMFandtonegenerationinvoice
10.1.6Transmitdatastate
10.2Actioncontrols(configurationcommand)
10.2.1Receivegainselection
10.2.2Volumeselection
10.2.3DTE/DCEinactivitytimer
10.2.4Analoguesource/destinationselection
10.2.5Ringingtonegoesawaytimer
10.2.6Ringingtoneneverappearedtimer
10.2.7Silencedetection(QUIETandSILENCE)
10.2.8Compressionmethodselection
10.2.9Beeptonerdurationtimer
10.3Responsecontrols(configurationcommands)
10.3.1Distinctivering(ringcadencereporting)
10.3.2Controltonecadencereporting
10.4DTE/DCEinterface(configurationcommands)
10.4.1Bufferthresholdsetting
10.4.2Voicepacketprotocol
10.4.3SelectDTE/DCEinterfacerate(turnoff
automaticratedetection)
10.5Speakerphonecommands
10.5.1Voicespeakerphonestate
10.5.2Microphonegain
10.5.3Speakergain
10.5.4Trainacousticecho-canceller
10.5.5Trainlineecho-canceller
10.5.6Speakerphoneduplexmode
10.5.7+VEM=
AnnexAInterworkingwithexistingvoiceDTE
AppendixI
I.1Suggestedcompressionmethodandsamplerate
selection
I.2Recordingawelcomemessage
I.3Playbackthewelcomemessage
I.4Answerthephone,playthegreetingmessageand
recordamessage
I.5Answerthephone,recordamessageandreceivea
facsimile
I.6Answerthephoneanddetermineitisfacsimile
I.7Answerthephoneandexecuteafacsimileprotocol
I.8Answerthephoneandexecuteadatahandshake
AppendixII
II.1ProjectedDTE/DCEinterfaceratesatdifferent
samplingrates
II.2Commonanalogsource/destinationhardware
configurations
AppendixIIINorthAmericannetworkdocuments

Abstract

Builds on and extends the Asynchronous DCE "AT" command set specified in Recommendation V.250. Covers a DCE command and response syntax for voice playback and record, for generation and detection of DTMF and other tones, in addition to a syntax for switching between data mode, facsimile mode and other future modes of operation. The additional mechanisms specified in this Recommendation permit a DTE combined with a V.253-equipped DCE to implement Telephone Answering Device and optional Speakerphone functions, and to switch to appropriate data, facsimile or other operation modes, dependent on the kind of incoming call.

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