Rockwell RCV144ACx, Command Reference Manual, Page: 150 / 186

AT Command Reference Manual
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Table 7-5. Device Types Supported by #VLS
ASCII Digit Device Type and Considerations
0 Telephone Line with Telephone handset. This is the default device selected. In this configuration, the
user can pick up a handset which is connected to the same telephone line as the modem, and * record
both sides of a conversation with a remote station. The modem currently supports one telephone
line/handset, which is in the first position of the #VLS =? response. (Note that the modem can interface
to multiple telephone lines by having “0”'s in multiple positions in the #VLS ? response.) If a telephone
line is selected, the modem must be on-hook or it hangs up. The OK message is generated.
1 Transmit/Receive Device (other than telephone line). This is a handset, headset, or speaker-phone
powered directly by the modem. When such a device is selected, the modem immediately enters Online
Voice Command Mode, DTMF monitoring is enabled if applicable, and the VCON response is sent. The
modem supports one such device as the second device listed in the #VLS =? response.
2 Transmit Only Device. Normally, this is the onboard speaker. When this device is selected, the modem
immediately enters Online Voice Command Mode, and the VCON response is sent. The modem
supports selection of the internal speaker as the third device listed in #VLS =? response.
3 Receive Only Device. Normally, this is a microphone. When such a device is selected, the modem
immediately enters Online Voice Command Mode, DTMF monitoring is enabled if applicable, and the
VCON response is sent. The modem supports one microphone as the fourth element returned in the
#VLS =? response.
4 Telephone line with Speaker ON and handset. This device type can be used to allow the DTE to
select the telephone line/handset (if picked up) with the modem speaker also turned ON. This can be
used by the DTE to allow the user to monitor an incoming message as it is recorded.
5 Telephone Emulation. This is a headset or speakerphone powered directly by the modem. When such
a device is selected, the modem immediately enters Online Voice Command Mode, DTMF monitoring is
enabled if applicable, and the VCON response is sent.
6 Speakerphone. This is a headset or speakerphone powered directly by the modem. When such a
device is selected, the modem immediately enters Online Voice Command Mode, DTMF monitoring is
enabled if applicable, and the VCON response is sent.
7 Muting the Local Handset During Phone Conversation - Music on Hold. This command mutes the
local handset by switching the handset or speakerphone out of the telephone line path if in #VLS=0 or
#VLS=6 mode. To unmute, the host software should issue AT#VLS=0 or AT#VLS=6 to return to phone
line or speakerphone mode, respectively.
On hardware designs which incorporate the audio codec, #VLS=7 can be used to route the codec's
output through the phone line to provide music-on-hold feature.
8 Recording a Handset Conversation on Phone Line. This command engages the Caller ID relay to
allow recording of conversation when using a handset by routing the signal to the audio codec (if
populated). To deactivate the Caller ID relay, the host should issue AT#VLS=0 or AT#VLS=6 to return to
phone line or speakerphone mode, respectively.
9 Recording/Playback from Handset through Sound Chip.This command (valid after Voice On-line
mode) routes the handset to the sound codec to allow recording/playback of audio (e.g. greeting
messages) through the local handset.