ITU-T V.25bis Dialing Commands and Responses
D-33910-A2-GN32-40 September 1998

Delayed Call Indicator

The DLC response is issued to the DTE if the modem is not currently allowed to call the number.
DLC is similar to the AT result code DELAYED.
The DLC response format is:
DLCn
Where: n is the delay (in minutes) before the number can be called.
Call Answer Commands
Call Answer commands disable or enable the modem’s AutoAnswer function. These commands
are issued from the DTE. Call Answer commands include Incoming Call (INC), Disregard
Incoming Call (DIC) and Connect Incoming Call (CIC).

Incoming Call (INC)

The INC response informs the DTE that the modem has detected a ring tone. At this point, the
DTE can issue the DIC command to disable the modem from answering the call. INC is similar to
the AT result code RING.

Disregard Incoming Call (DIC)

The DIC command prevents the modem from answering an incoming call. This command is only
valid once the DTE receives an incoming call (INC) response from the modem. A DIC must be
issued within 5 seconds after receiving an INC.
The DIC command format is DIC.
If DIC is issued within 5 seconds, the modem sends the VAL response to the DTE. If DIC is issued
after 5 seconds, INV is returned.

Connect Incoming Call (CIC)

The CIC command forces the modem to cancel any DIC commands and answer an incoming call.
This command is only valid when the DTE issues a DIC command. CIC must be issued within 10
seconds after sending a DIC. CIC is similar to the ATA command.
The CIC command format is CIC.
If CIC is issued within 10 seconds, the modem sends the VAL response to the DTE. If CIC is
issued after 10 seconds, INV is returned.