#VTX - Voice Transmit

This action command can be issued if and only if the modem is in the Online Voice Command Mode (indicated previously with the VCON message), and is the switch to Voice Transmit Mode. #VTX is used when a voice file is to be transmitted to the line, speaker, or handset. The #VLS command should have been previously issued to select the output source.

Parameters:
None

Result Codes:
OK - When voice transmission by DTE can begin.

ERROR - If #VLS=0 and output device not connected.

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