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COMSPHERE 3821Plus Modem
F-2 February 1998 3821-A2-GB20-30
Call Request Commands
Call Request commands are issued from the DTE to
the modem and are responsible for initiating any dial
calls. Call Request commands include Call Request with
Number Provided (CRN), Call Request with Stored
Memory Address Provided (CRS).
Call Request with Number Provided (CRN)
The CRN command dials the telephone number
entered from the DTE. CRN is similar to the ATD
command.
The CRN command format is:
CRNn
Where: n is the dial string. The following
characters are permitted:
T DTMF Dialing
P Pulse Dialing
0–9 DTMF Tones or Pulse .
Dialed Digits
* # A B C D DTMF Tones
R Reverse Dial
: Wait for Dial Tone
, or < User-Defined Pause
& Flash Hook
= or > Delimiters
Call Request with Stored
Memory Address Provided (CRS)
The CRS command dials the telephone number stored
in the request directory location. CRS is similar to the
ATDS command.
The CRS command format is:
CRSx
Where: x is directory location 1–10.
The modem responds to the command with either a
VAL (valid) or INV (invalid) response followed by a call
progress report such as connect (CNX) or failure (CFI).
Call Response
A Call Response indicates if the command was
accepted by the modem. Call Response includes Call
Failure Indication (CFI) and Call Connecting (CNX).
Call Failure Indication (CFI)
The CFI response is issued to the DTE if the modem
fails a CRN or CRS command. CFI is similar to the AT
result codes BUSY, NO ANSWER, NO CARRIER, NO
DIALTONE, and ERROR.
The CFI response format is:
CFIxx
Where: xx is
ET Engaged tone
NS Number not stored
CB Local DCE busy
RT Time-out on ring tone
AB Abort call on time-out
NT Answer tone not detected
FC Forbidden call
ET is similar to the Call Failure Messages Busy Signal
and Trunk Busy and the result code BUSY.
NS is similar to the Common Operational Message
Invalid Number and the result code ERROR.
CB is similar to the Call Failure Messages Dial Line in
Use and No Dial-Test and the result code ERROR.
RT is similar to the Call Failure Message No Answer
Tone and the result code NO CARRIER.
AB is similar to the Call Failure Messages No Dial
Tone and No Dial-DTR and the result code NO
DIALTONE and ERROR.
NT is similar to the Call Failure Message No Quiet
Answer and the result code NO ANSWER.
Delayed Call Indication (DLC)
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:
DLCxx
Where: xx is the delay before the number may be
called, in minutes.