Intel Intel Confidential, IS-101Voice Mode AT Commands, 536EX Chipset Developer’s Manual, +Vrx

Page 79
+VRX

IS-101 Voice Mode AT Commands

Table 25. Voice Mode Command Descriptions (Continued)

Command

Default

Description

 

 

 

 

 

Record Mode: This command causes the modem to enter record mode to record voice messages.

 

 

Upon receiving the AT+VRX command, the modem responds to the DTE with a ‘CONNECT’ message

 

 

at the current DTE-to-modem rate. It is important that the UART DTE-to-modem rate be equal or

 

 

higher to the compression-scheme-required UART data rate (for example, CL1 at 4800 samples/

 

 

second requires 57,600 bps). If the DTE-to-modem data rate is lower than the compression-scheme-

 

 

required UART data rate, then data may be lost or may be garbled during playback of the message.

 

 

After sending the ‘CONNECT’ message, the modem then sends digitized voice data that is <DLE>-

 

 

shielded to the DTE. The modem buffers the data to ensure steady voice delivery even though the

 

 

voice data may be transferred to the DTE in bursts. The DTE may use the <DLE><NUL> shielded code

 

 

as a no-operation command to refresh the inactivity timer.

 

 

During voice receive mode, the modem informs the DTE about pertinent events that may prompt the

 

 

DTE to terminate the voice receive state. The DCE sends <DLE> codes for detection of signals such as

 

 

busy tone, dial tone, DTMF tone, and codes for ‘Presumed End of Message’ or ‘Presumed Hang-up.’

 

 

Record mode is terminated whenever the modem issues a <DLE><ESC> command or provides a DTE/

+VRX

none

DCE inactivity timer time-out. Upon detecting the terminating character, the modem stops sampling the

analog data. The modem then terminates record mode by sending the remaining voice data stored in

 

 

 

 

its internal buffer, <DLE><ETX>, and an ‘OK’ message to the DTE.

 

 

In some situations, the application software may want to abort record mode and immediately perform a

 

 

new function without first reading all the recorded voice data from the modem’s internal buffer (for

 

 

example, after detecting fax calling tone). This is accomplished by sending <DLE><!> to the modem

 

 

while in record mode. Upon seeing <DLE><!>, the modem terminates record mode, clears the

 

 

modem’s internal record buffer, and issues a <DLE><ETX> to the DTE followed by an ‘OK’ message.

 

 

The modem may immediately abort record mode if it receives either an AT+VIT=m time-out or a DTR

 

 

toggle. If +VIT≠0 and the modem has not received any data or a <DLE><NUL> code before the +VIT

 

 

timer times out, then the modem immediately aborts record mode. The modem then hangs up the line

 

 

and changes to data mode (+FCLASS=0). If the UART DTR signal is toggled on-off-on, then the

 

 

modem follows the &Dn setting. If configured for &D2 or &D3, the modem immediately aborts record

 

 

mode, hangs up the line, and changes to data mode (+FCLASS=0).

 

 

NOTE: The voice sampling rate and sampling mode must be the same values as used during record

 

 

mode.

 

 

 

 

 

Silence Detection (Quiet and Silence): This command allows the DTE to set two parameters: <sds>

 

 

reports the sensitivity for silence detection, and <sdi> reports the length of silence required for the

 

 

DCE to report silence when receiving voice.

 

 

The <DLE><s> silence timer starts immediately after entering record mode. The modem stops using

 

 

the <DLE><s> timer and starts using the <DLE><q> timer if:

•the <DLE><s> silence timer has timed out and a <DLE><s> code has been sent to the DTE, or

•if noise or voice energy has been detected above the silence detection threshold (as defined by <sds>).

 

 

m = <sds>, <sdi>

+VSD=m

see ‘m’

Defaults: m = 128, 50

<sds> Silence Sensitivity: If the received analog signal stays below this specified level for a user-

 

 

 

 

specified time delay, the modem sends <DLE><q> to the DTE. The modem sends only one <DLE><q>

 

 

to the DTE each time record mode +VRX is entered.

 

 

Range: 121–131

 

 

128*

Nominal level

 

 

<sdi> Length of Silence: This parameter sets the period of silence that must elapse before the DCE

 

 

reports silence (as detected by ‘Quiet’ or ‘Silence’).

 

 

Range: 0–255 (units of 0.1 second)

 

 

0

Silence detection disabled

 

 

50*

Silence detection enabled

NOTE: An asterisk (*) denotes the factory-default setting.

536EX Chipset Developer’s Manual

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Intel Confidential

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Contents Developer’s Manual 536EX ChipsetJanuary 536EX Chipset Developer’s Manual Intel ConfidentialContents ContentsFigures Tables Description Revision HistoryDate Revision1.1Controllerless Modem Driver Overview IntroductionKernel - ring0 Figure 1. WDM Driver Block Diagram1.1.2Windows 95 and Windows User applications1.2V.90/V.92 and V.34 Data Modes Figure 2. VxD Mini Port Driver Block Diagram1.3Modem Connection Overview Table 2. DCE-to-DCEData Rates for Each Mode Table 1. DTE-to-DCEData Rates for Each ModeTable 3. DCE-to-ISPData Rates for V.90 Mode Table 4. DTE-ModemData Rate Response Codes 1.4.1Sending Commands1.4.3Dial Modifier 1.4.2AT Escape SequencesAT Command Summary Tables AT Command Summary TablesTable 5. Data Mode Command Summary Table 5. Data Mode Command Summary Continued Result code type 536EX Chipset Developer’s Manual Generate data mode calling tone Table 6. V.44/V.42/V.42 bis MNP Command Summary 536EX Chipset Developer’s Manual Table 8. Fax Class 1 Command Summary Table 7. Fax Identity Command SummaryTable 10. Voice DTE→DCE Character Pairs Table 9. IS-101Voice Command SummaryTable 11. Voice DTE←DCE Character Pairs Table 10. Voice DTE→DCE Character Pairs ContinuedTable 12. Dial Modifiers Table 11. Voice DTE←DCE Character Pairs ContinuedTable 13. S-RegisterSummary Table 13. S-RegisterSummary Continued Data Mode AT COMMANDS Data Mode AT COMMANDS•ATW2 Table 14. Data Reporting Wn MappingFigure 3. Example of a Remote Connection ATW0Intel Confidential +FMFR?, +FMDL?, +FREV? 3.7Hanging Up Hn, S10, Zn, &D2 3.6Online Command Mode Escape Codes, On3.8Modem-to-ModemConnection Data Rates Intel Confidential +++AT +PMH=0+PCW=0 +VCID=1Intel Confidential hook to connect the call. Now you can answer the phone and talk. After completing your voice conversation, the modem will issue another +PMHF and ATO command to initiate a Quick Connect. If the server rejects the request to go on hold, the user can stay on line ATO command issued or disconnect from his initial data connection ATH command issued Table 16. Supported Modulation Types 3.9.1Local Analog Loopback AT&T1 3.9Diagnostic Testing S18, &TnLocal Modem or Test Modem 3.9.2Local Analog Loopback With Self-TestAT&T8LOCAL MODEM Figure 6. Local Analog Loopback TestLicensing Requirements for Hayes Escape Sequence 3.10.1Time-IndependentEscape SequenceFormat <char1><char2><char3><AT command><contents of S3>char1 = char2 = char3 = escape character S2 3.10.2Hayes* Escape Sequence Table 18. Data Mode Command DescriptionsIntel Confidential Sn=x Intel Confidential Data Mode AT COMMANDS536EX Chipset Developer’s Manual 536EX Chipset Developer’s Manual AT&V0 Intel Confidential Indication Command DefaultDefinition 1, 0, Intel Confidential +ETBM +ESR1, 1, +ILRR=m +GMR+GSN +IFC536EX Chipset Developer’s Manual see ‘m’ <carrier>Description +MS=m+PMHR +PHSW=+PMHF <value>Intel Confidential Error Correction and Data Compression Error Correction and Data Compression4Table 19. Operating Modes NOTES Table 20. Resulting +ES Connection TypesIntel Confidential Error Correction and Data Compression536EX Chipset Developer’s Manual Intel Confidential <max string> +DR=mdirection +DS=m+EFCS=m 3768+ER=m +ES=m Fax Class 1 AT Commands Fax Class 1 AT Commands5.1Fax Identity Commands 5.2Fax Class 1 CommandsTable 23. <mod> Selection Table Figure 8. T.30 HDLC Frame Format Table 24. Fax Mode Command Descriptions shown in Table 23 on page Table 24. Fax Mode Command Descriptions Continued+FRH=m Refer to Table 23 on page+FTH=m IS-101Voice Mode AT Commands IS-101Voice Mode AT Commands6.1DTMF Detection Reporting Table 25. Voice Mode Command Descriptions6.2Relay Control m = <deassert>, <assert> +FLO=m+VDR=m m=<enable>, <report>+VEM=m m = <mask>Intel Confidential +VIP +VLS=m Preassigned Voice I/O LabelsRelay/Playback Control: cont Voice I/O Primitive Codesm = <sds>, <sdi> +VRX+VSD=m +VSM=m m= <cml>, <vsr>, <scs>, <sel>Transmission: Range: +VSP=m Compression Method Selection: contfactory default is ‘0’ none +VTS=mDTMF and Tone Generation: cont CommandDefault DescriptionTable 26. S-RegisterCommand Descriptions S-RegistersS-Registers S-Registers Intel Confidential536EX Chipset Developer’s Manual S-Registers Intel Confidential536EX Chipset Developer’s Manual S-Registers Intel Confidential536EX Chipset Developer’s Manual S-Registers Caller ID Caller IDTable 27. Caller ID Tags for Formatted Reporting NMBR = RING DATE = TIME = NMBR = NAME = DOE JOHN MESG =RING RING <DLE> RFigure 11. UART Emulation in Intelsdb.VxD Parallel Host Interface 16C450/16C550AUART Parallel Host Interface 16C450/16C550A UARTUART Receiver Flow Diagram UART Transmitter Flow DiagramNAME REGISTERBIT NUMBER ADDRESSFigure 15. Modem Status Register MSR 9.2.1Scratch Register SCR9.2.2Modem Status Register MSR Figure 14. Scratch Register SCRFigure 16. Line Status Register LSR 9.2.3Line Status Register LSRFigure 18. Line Control Register LCR 9.2.4Modem Control Register MCR9.2.5Line Control Register LCR Figure 17. Modem Control Register MCRRegister 9.2.6FIFO Control Register FCRFigure 19. FIFO Control Register FCR Figure 20. Interrupt Identity Register IIR 9.2.7Interrupt Identity Register IIRTable 28. Interrupt Control Functions Figure 22. Transmitter Holding Register THR 9.2.8Interrupt Enable Register IERFigure 21. Interrupt Enable Register IER 9.2.9Transmitter Holding Register THRFigure 24. Divisor Latch Registers DLM and DLL 9.2.10Receiver Buffer Register RBR9.2.11Divisor Latch Registers DLM and DLL Figure 23. Receiver Buffer Register RBR9.3.1FIFO Interrupt Mode Operation 9.316C550A UART FIFO Operation9.3.2FIFO Polled Mode Operation Parallel Host Interface 16C450/16C550A UART Intel Confidential536EX Chipset Developer’s Manual
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