Lucent Technologies Host-Based Controller Modem AT Data Addendum page 50

Host-Based Controller Modem
AT Command Set
AT Voice Commands Reference (continued)
Example # 1: Initiating a speakerphone call (with phone muting during 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
AT+FCLASS=8
OK
AT+VGT=128
OK
AT+VLS=7
OK
ATD5551234
OK
Call is placed through phone network. Caller can hear ringback or busy signal from the phone being called. If the
person at the other end picks up the phone, caller and callee converse. If the speakerphone user decides to
mute his speakerphone, the application sends the following to mute the speakerphone.
Command
AT+VLS=5
OK
After a while, the speakerphone user decides to turn the mic back on (mute off). This is done when the
application issues the following command.
Command
AT+VLS=7
OK
Conversation ends, and user hangs up.
Command
ATH
OK
Speakerphone is now on-hook. The speaker and mic have been detached from the system, and the modem
is now in data mode (+FCLASS=0).
50
Description
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 audible,
speaker and microphone ready to use.
Provide dial string for DCE to place the call.
DCE responds. Number is dialed.
Description
Enter Mute Mode. Mic is disconnected from the line, leaving the speaker only.
DCE responds. The mic is no longer connected to the line, and the
speakerphone is mute.
Description
No Mute. Microphone is reattached to system along with speaker.
DCE responds. Speakerphone with both mic and speaker is operational.
Description
Application tells the modem to terminate the call with standard AT command.
DCE responds.
Lucent Technologies Inc.
Data Addendum
June 15, 1998
Version 1.0