Comtrol AT Commands for SmartACFL - Manual (Page 127)

Command Reference Manual
100722A Conexant 5-5
5.3.1 ATD - Originate a Call
Syntax: ATD....<CR>
The DCE can support a DTE command to originate a call using the ATD command (see Section 3.2).
If this command is unsuccessful, the DCE reports an appropriate failure or error type result code such as NO CARRIER, NO
DIAL TONE, or BUSY (see Section 3.3).
If this call is successful, the typical DCE response is:
ATDnn..nn (go off-hook, dial, get CED)
+FCON (DCE detects flags)
[+FCSI:<remote ID string>]
+FDCS:<T.30 subparameter string>
OK
The DCE dials, detects call progress, and generates the CNG tone. It then waits for a DIS frame. On detection of the first
Phase B preamble (V.21 ch. 2 modulated by 300 bps HDLC flags), it reports the “+FCON” message to the DTE. The DCE
then switches to 19200 bps.
The DCE generates a DCS frame based on the received DIS frame and on the previously set +FDIS parameter. A +FDT
command from the DTE releases the DCE to transmit that DCS frame.
The DCE reports the initial received T.30 negotiation messages, including the DIS frame and the optional CSI ID string. The
+FDIS: report is followed by the OK final result code.
5.3.2 ATA - Answer a Call
The DCE can support a DTE command to answer an incoming call using the ATA command (see Section 3.2).
The DTE may issue an Answer command in response to an incoming ring.
If the Answer command is unsuccessful, the DCE will report an appropriate failure or error type result code, such as NO
CARRIER (see Section 3.3).
5.3.2.1 Manual Call Answer
If this call is successful, the typical DCE response (answer and receive) is:
+FCON
[+FTSI:<remote ID string>]
+FDCS:<T.30 subparameter string>
OK
(DTE should issue +FDR command here)
Upon receipt of an Answer command from the DTE, the DCE answers and generates the CED tone. The DCE then generates
a DIS frame (derived from the +FDIS parameter) and hunts for the first T.30 negotiation frames. Upon detection of the first
Phase B preamble (V.21 ch 2 modulated by 300 bps HDLC flags), it reports the “+FCON” message to the DTE.
The DTE should report the initial received T.30 negotiation messages, including the DCS frame. The +FDCS: report will be
followed by the OK final result code.
5.3.2.2 Automatic Answer
The modem provides for automatic answering of incoming calls. If configured for automatic answer, the modem answers an
incoming call in compliance with T.30, and reports the same messages as described for manual answer.
5.3.2.3 Connection as a Data Modem
If configured to do so by the +FAA parameter, the DCE will adaptively answer as a facsimile DCE or as a data DCE. If the
DCE answers as a data DCE, it resets the +FCLASS parameter to 0 and issues the appropriate final result code (e.g.,
CONNECT, or NO CARRIER) to the DTE.