Lucent Technologies Host-Based Controller Modem AT Data Addendum page 53

Data Addendum
June 15, 1998
AT Voice Commands Reference (continued)
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
<DLE>-e
AT+FCLASS=0
OK
ATA
CONNECT
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
AT+VLS=1
OK
AT+VTX
CONNECT
<Data>
<DLE><ETX>
OK
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
RING
AT+FCLASS=8
OK
AT+VGT=128
OK
AT+VSM=132,8000
OK
Version 1.0
Description
DCE detects data calling tone from the remote modem and informs the
application by sending DLE-e sequence.
Application switches modem out of voice mode, and into data mode.
DCE responds. Now in data mode, still off-hook and connected to incoming call.
Application instructs modem to answer data call using standard AT commands.
DCE responds. The call is answered, and modem continues with procedures to
establish connection.
Description
Applications switches modem out of speakerphone mode and into TAD mode.
DCE responds. Now in TAD mode.
DTE selects voice transmit mode.
DCE responds.
DTE plays music through modem to remote caller.
DTE indicates end of voice transmit data.
DCE acknowledges switch back to voice command state.
Description
DCE reports ringing from remote station.
The modem enters voice mode.
DCE responds.
Set speaker volume to normal.
DCE responds.
DTE selects IMA ADPCM with 8.0 kHz sampling rate.
DCE responds.
Lucent Technologies Inc.
Host-Based Controller Modem
AT Command Set
53