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Data Addendum Host-Based Controller Modem
June 15, 1998 AT Command Set
AT Voice Commands Reference (continued)
Version 1.0 Lucent Technologies Inc.
53
Example # 5: Receiving an incoming data call in speakerphone or TAD mode and switching to data mode
In this example, the sequence begins at the point of the user or telephone answering device (TAD) taking the
speakerphone off-hook and detecting a data calling tone from the other end.
Command Description
<DLE>-e DCE detects data calling tone from the remote modem and informs the
application by sending DLE-e sequence.
AT+FCLASS=0 Application switches modem out of voice mode, and into data mode.
OK DCE responds. Now in data mode, still off-hook and connected to incoming call.
ATA Application instructs modem to answer data call using standard AT commands.
CONNECT DCE responds. The call is answered, and modem continues with procedures to
establish connection.
Example # 6: Switching from speakerphone mode to TAD mode
In this example, the sequence begins at the point of the user in speakerphone mode and at some point in time
wants to put the other end in hold. The application may switch to TAD mode in hold state and play some music
wave file to the line.
Command Description
AT+VLS=1 Applications switches modem out of speakerphone mode and into TAD mode.
OK DCE responds. Now in TAD mode.
AT+VTX DTE selects voice transmit mode.
CONNECT DCE responds.
<Data> DTE plays music through modem to remote caller.
<DLE><ETX> DTE indicates end of voice transmit data.
OK DCE acknowledges switch back to voice command state.
The Application may switch back to speakerphone mode by following the example to switch from TAD mode to
speakerphone mode.
Example # 7: Call screening & recording a message using TAD - IS101 <dle> shielded method.
The TAD application is loaded. The modem is initially idle, in data mode (+FCLASS=0).
Command Description
RING DCE reports ringing from remote station.
AT+FCLASS=8 The modem enters voice mode.
OK DCE responds.
AT+VGT=128 Set speaker volume to normal.
OK DCE responds.
AT+VSM=132,8000 DTE selects IMA ADPCM with 8.0 kHz sampling rate.
OK DCE responds.