Example #2: Initiating A Stored Number Speakerphone Call; Example #3: Answering A Speakerphone Call - US Robotics 56K USB Modem User Manual

Example #2: Initiating a Stored Number Speakerphone Call

The speakerphone application is loaded. The modem is initially idle in data mode. The user then decides to
place a speakerphone call either by entering the number without first going off-hook or by selecting a
number previously stored in the application. When the user tells the application to dial, the following events
occur:
Command/Response
ATD5551234
OK
The call is placed through the phone network in data mode. The modem stays in command mode, and the
application should wait for the OK before sending next command.
Command/Response
AT+FCLASS=8
OK
AT+VGT=128
OK
AT+VLS=7
OK
The caller can hear ringback or busy signal from the phone being called. If the person at the other end
picks up, the caller and the person on the other end converse. The conversation then ends, and the
speakerphone user hangs up.
Command/Response
ATH
OK

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/Response
RING
AT+FCLASS=8
OK
AT+VGT=128
OK
Provide a dial string appended with a semicolon (;) for the DCE to place the
call and go to command mode.
DCE responds, and the number is dialed.
Put the modem into voice mode.
DCE responds: The modem is now in voice mode.
Set the speaker volume to normal level.
DCE responds: The volume level is set.
Start the speakerphone by attaching the internal speaker and microphone to
the line; DCE off-hook.
DCE responds: Speakerphone mode is active. The phone is off-hook; dial
tone is audible, and the speaker and microphone are ready to use.
The application tells the modem to terminate the call with a standard AT com-
mand.
DCE responds: The speakerphone is now on-hook. The speaker and micro-
phone have been detached from the system, and the modem is now in data
mode (+FCLASS = 0).
DCE reports ringing from remote station. The user decides to pick up the
phone,
which should initiate the commands listed below in this table.
Modem enters voice mode.
DCE responds. Now in voice mode.
Speaker volume set to normal.
DCE responds. Volume level is set.
Description
Description
Description
Description
Command Reference - 111
56K USB Modem
User Guide