Example #1: Initiating A Speakerphone Call (With Phone Muting During Conversation) - US Robotics 56K USB Modem User Manual

Example #1: Initiating a Speakerphone Call (with Phone Muting Dur-
ing Conversation)
The speakerphone application is loaded. The modem is initially idle in data mode. The user then decides to
pick up the phone to place a speakerphone call. Picking up the phone should initiate the following chain of
events.
Command/Response
AT+FCLASS=8
OK
AT+VGT=128
OK
AT+VLS=7
OK
ATD5551234
OK
The call is placed through the phone network. The caller can hear ringback or busy signal from the phone
being called. If the person at the other end picks up the phone, the caller and the person at the other end
converse. If the speakerphone user decides to mute his speakerphone, the application sends the following
to mute the speakerphone.
Command/Response
AT+VLS=5
OK
After a while, the speakerphone user decides to turn the microphone back on (mute off). This is done when
the application issues the following command.
Command/Response
OK
The conversation ends, and the user hangs up.
Command/Response
OK
The speakerphone is now on-hook. The speaker and microphone have been detached from the system,
and the modem is now in data mode (+FCLASS=0).
The modem enters voice mode.
DCE responds. Now in voice mode.
Set speaker volume to normal level.
DCE responds. Volume level is set.
Attach internal speaker and microphone, DCE off-hook
DCE responds. Now in speakerphone mode. Phone off hook, dial tone audi-
ble, speaker and microphone ready to use.
Provide dial string for DCE to place the call.
DCE responds. Number is dialed.
Enters mute mode. Microphone is disconnected from the line, leaving the
speaker only.
DCE responds. The microphone is no longer connected to the line, and the
speakerphone is mute.
No mute. Microphone is reattached to system along with speaker.
DCE responds. Speakerphone with both microphone and speaker is opera-
tional.
Application tells the modem to terminate the call with standard AT command.
DCE responds.
Description
Description
Description
Description
Command Reference - 110
56K USB Modem
User Guide