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COMSPHERE 3900 Series Modems
D-2 September 1998 3910-A2-GN32-40
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 1–24.
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 is Engaged tone.
NS is Number not stored.
CB is Local DCE busy.
RT is Time-out on ring tone.
AB is Abort call on time-out.
NT is Answer tone not detected.
FC is 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.
Call Connecting (CNX)
The CNX response informs the DTE that the modem has connected to the remote modem. CNX is
similar to the AT result code CONNECT.
The CNX response format is CNX.