Result Codes for Voice Operation
VCON
VCON is sent when the modem is configured for voice (#CLS=8), or when
after answering or originating a call, the modem enters the Online Voice
Command Mode for the first time. Typically, this is immediately after an
off-hook in answer mode, and after ringback ceases in originate mode. VCON
is also sent when the DTE requests a switch from Voice Transmit Mode to
Online Voice Command Mode by issuing a <DLE><ETX>to the modem,
or when the DTE requests a switch from Voice Receive Mode to Online Voice
Command Mode via the key abort.
CONNECT
CONNECT is sent when switching from the Online Voice Command Mode to
either Voice Receive Mode via the #VRX command, or to Voice Transmit Mode
via the #VTX command. This message is sent to the DTE to inform it that
it may begin receiving or sending ADPCM data.
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