Online Voice Command Mode
Online Voice Command Mode is the default Voice submode entered when
the #CLS=8 command is issued, and may also be entered from Voice Receive
Mode or Voice Transmit Mode. Entry into Online Voice Command Mode is indicated
to the DTE via the VCON message, after which AT commands can be entered
without aborting the telephone line connection.
If the modem is the answerer, it enters Online Voice Command Mode im-mediately
after going off-hook, and can report instances of DTMF tones and calling
tones to the DTE. If the modem is the originator, it enters Online Voice
Command Mode based on detection of the ringback cadence going away, upon
expiration of the ringback never came timer, or upon detection of answer
tone, and the modem can report DTMF tones, answer tones, busy tone, and
dial tone to the DTE.
Note: The DTMF tone reporting is supported in this mode if DTMF reporting
is enabled via the #VTD command.
When Online Voice Command mode is entered as a result of going off-hook
with the D or A command, VCON is always sent to the DTE, after which the
modem accepts commands. If this mode is entered from Voice Transmit Mode,
the DTE has issued the <DLE><ETX>, and the modem
responds with VCON. If this mode is entered from the Voice Receive Mode
because of a key abort, the modem issues the <DLE><ETX>followed
by VCON.
If the #VLS command has switched in a handset or other device in place of
the telephone line, Online Voice Command Mode is immediately entered, whereas
if the telephone line is selected, a physical connection with another station
must occur before entering this mode.
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