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Host-Based Controller Modem Data Addendum
AT Command Set June 15, 1998
AT Voice Commands Reference (continued)
Lucent Technologies Inc. Version 1.0
50
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 Description
AT+FCLASS=8 The modem enters voice mode.
OK DCE responds. Now in voice mode.
AT+VGT=128 Set speaker volume to normal level.
OK DCE responds. Volume level is set.
AT+VLS=7 Attach internal speaker and microphone, DCE off-hook.
OK DCE responds. Now in speakerphone mode. Phone off hook, dial tone audible,
speaker and microphone ready to use.
ATD5551234 Provide dial string for DCE to place the call.
OK DCE responds. Number is dialed.
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 Description
AT+VLS=5 Enter Mute Mode. Mic is disconnected from the line, leaving the speaker only.
OK DCE responds. The mic is no longer connected to the line, and the
speakerphone is mute.
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 Description
AT+VLS=7 No Mute. Microphone is reattached to system along with speaker.
OK DCE responds. Speakerphone with both mic and speaker is operational.
Conversation ends, and user hangs up.
Command Description
ATH Application tells the modem to terminate the call with standard AT command.
OK DCE responds.
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).