D. CCITT V.25 bis Dialing Commands and Response
D-5
3830-A2-GB91-20
November 1996
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.