AT Command Reference Manual
1048
7-9
7.2.8 Voice Call Termination
Local Disconnect
The DTE can disconnect from a telephone call by commanding a mode change to Online Voice Command Mode (if not
already in it), and by issuing the H command.
Remote Disconnect Detection
When in Voice Receive Mode, the modem sends the proper shielded <DLE> code when dial tone or busy tone is detected.
The modem stays in Voice Receive Mode, however, until the DTE issues a key abort to force Online Voice Command Mode.
The DTE must issue the H command if it wishes to hang up.
7.2.9 Mode
Switching
Voice to Fax
If the modem is in Online Voice Command Mode (i.e., it has gone off-hook with #CLS=8 in effect), the DTE can attempt a
fax handshake by setting #CLS=1, followed by the A or D command corresponding to fax receive or send. This has the
effect of beginning a fax Class 1 handshake (see #CLS command).
Unsuccessful Fax Connection Attempt to Voice
A fax handshake which does not succeed, attempted as the result of the DTE modifying the #CLS setting from voice (8) to
fax (1), does not result in the modem hanging up, allowing the DTE the flexibility of commanding a switch back to Voice
Mode with #CLS=8.
Voice to Data
If the modem is in the Online Voice Command Mode, the DTE can attempt a data handshake by setting #CLS=0 followed by
the A or D command. This has the effect of beginning a Data Mode handshake according to the current Data Mode S-
register and command settings.
Unsuccessful Data Connection Attempt to Voice
A data handshake which does not succeed, attempted as the result of the DTE modifying the #CLS setting from voice (8) to
data (0), does not result in the modem hanging up, allowing the DTE the flexibility of commanding a switch back to Voice
Mode with #CLS=8.
7.2.10 Caller
ID
The modem supports Caller ID by passing the information received in Bell 202 FSK modulation to the DTE after the first
RING detect. The modem supports both formatted and unformatted reporting of Caller ID information received in ICLID
(Incoming Call Line ID) format as supported in certain areas of the U.S. and Canada. The DTE enables this feature via the
#CID command.
Summary of Contents for RCV144ACx
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