
D. CCITT V.25 bis Dialing Commands and Response
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 < | |
& | 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).
August 1998 |