Voice Transmit Mode
Voice Transmit Mode is entered when the DTE issues the #VTX command
because it wants to transmit voice data. In this mode, the modem continues
to detect and report DTMF and calling tones if enabled by the #VTD command.
This mode is typically used when playing back greeting messages previously
received/recorded messages.
In this mode, voice decompression is provided by the codec, and decompressed
data is reconstituted into analog voice by the DAC at the original voice
compression quantization sample-per-bits rate. Optional silence interpolation
is enabled if silence deletion was selected for voice compression.
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