Lucent Technologies Host-Based Controller Modem AT Data Addendum page 52

Host-Based Controller Modem
AT Command Set
AT Voice Commands Reference (continued)
Example # 3: Answering a speakerphone call
The speakerphone application is loaded. The modem is initially idle, in data mode. In this mode, the modem is
always screening for incoming calls.
Command
RING
AT+FCLASS=8
OK
AT+VGT=128
OK
AT+VLS=7
OK
Speakerphone user picks up the phone and hears the caller from the other end. Conversation continues for
awhile. When it ends, the speakerphone user hangs up.
Command
ATH
OK
Note 1: When the local phone goes off-hook in the middle of a speakerphone call, the speakerphone
disconnects, and the DCE returns <DLE>-H to the DTE.
Note 2: When the speakerphone is on, call waiting (hold operation) is initiated by:
Command
ATD!
OK
Example # 4: Receiving an incoming FAX call in speakerphone or TAD mode and switching to FAX 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 FAX calling tone from the other end.
Command
<DLE>-c
AT+FCLASS=1
OK
ATA
OK
52
Description
DCE reports ringing from remote station. The user decides to pick-up the
phone, which should initiate the following:
Modem enters voice mode.
DCE responds. Now in voice mode.
Speaker volume set to normal.
DCE responds. Volume level is set.
Call is answered: Attach internal speaker and microphone to the line, DCE
off-hook.
DCE responds. Now in speakerphone mode, connected to the line
(call is answered).
Description
DTE issues standard command to terminate call.
DCE responds. Speakerphone goes on-hook. Speaker and microphone are
detached from system, and modem returns to data mode (+FCLASS=0).
Description
DTE sends hold command to DCE.
DCE responds.
Description
DCE detects FAX calling tone from the remote FAX and informs the application
by sending DLE-c sequence.
Application switches modem out of voice mode, and into FAX mode.
DCE responds. Now in FAX mode, still off-hook and connected to incoming call.
Application instructs modem to answer FAX call using standard AT commands.
DCE responds. The call is answered, and modem continues with procedures to
establish connection and receive FAX transmission. The application software
will then take care of disconnecting the call when the FAX is done, and returns to
data mode (+FCLASS=0).
Lucent Technologies Inc.
Data Addendum
June 15, 1998
Version 1.0