Chapter 4 - V.22bis Commands
V.22bis Call Control Commands
D Dial
This command directs the modem to go
The modem will behave as a data modem and will attempt to connect to another data modem. The modem will have up to the period of time specified by register S6 or S7 to wait for carrier and complete the handshake. If this time expires before the modem can complete the handshake, the modem will go
This command will be aborted while in progress (but before the completion of the handshake) upon receipt of any DTE character.
Dial Modifiers
The valid dial string parameters are described below. Punctuation characters may be used for clarity, with parentheses, hyphen, and spaces being ignored.
Syntax D<string>
Defined Values
<string> Character string corresponding to the selected option(s).
*The 'star' digit (tone dialing only).
# The 'gate' digit (tone dialing only).
L The modem will
P Pulse dial the numbers that follow until a "T" is encountered. Affects current and subsequent dialing. Some countries prevent changing dialing modes after the first digit is dialed.
T Tone dial the numbers that follow until a "P" is encountered. Affects current and subsequent dialing. Some countries prevent changing dialing modes after the first digit is dialed.
R This command will be accepted, but not acted on.
! Flash. the modem will go
W The modem will wait for dial tone before dialing the digits following "W". If dial tone is not detected within the time specified by S7 (U.S.) or S6 (other countries), the modem will abort the rest of the sequence, return
@ The modem will wait for at least 5 seconds of silence in the call progress frequency band before continuing with the next dial string parameter. If the modem does not detect these 5 seconds of silence before the expiration of the call abort timer (S7), the modem will terminate the call attempt with a NO ANSWER message. If busy detection is enabled, the modem may terminate the call with the BUSY result code. If answer tone arrives during execution of this parameter, the modem handshakes.
& Wait for credit card dialing tone before continuing with the dial string. If the tone is not detected within the time specified by S7 (U.S. models) or S6 (other countries), the modem will abort the rest of the sequence, return on- hook, and generate an error message.
, The modem will pause for a time specified by S8 before dialing the digits following ",".
; Return to command state. Added to the end of a dial string, this causes the modem to return to the command state after it processes the portion of the dial string preceding the ";". This allows the user to issue additional AT commands while remaining
^ Toggles calling tone enable/disable; applicable to current dial attempt only.
( ) Ignored; may be used to format the dial string.
-Ignored; may be used to format the dial string. <space> Ignored; may be used to format the dial string. <i> Invalid character; will be ignored.
> If enabled by country specific parameter, the modem will generate a grounding pulse on the EARTH relay output.
21 |