ATA - Answering in Voice
The answer action command works analogously to the way it works in Data
and FAX Modes except for the following conditions:
1. When configured for Voice Mode, the modem enters Online Voice Command
Mode immediately after going off-hook. When the #CLS=8 command is issued,
the modem can be programmed to look for 1100 and 1300 Hz calling tones,
thus eliminating the need to do so as part of A command processing. After
the VCON message is issued, the modem re-enters Online Voice Command Mode
while sending any incoming DTMF or Calling Tone indications to the DTE.
2. After answering in Voice Mode, the DTE, as part of its call discrimination
processing, can decide to change the #CLS setting to attempt receiving a
FAX in Class 1, or to make a data connection. In such a case, the DTE commands
the modem to proceed with the data or FAX handshake via the A command even
though the modem is already off-hook.
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