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I NTEGRATED C IRCUITS D IVISION
Dial Modifiers
Dial modifiers perform special functions within a dial
command. For example,
CPC2400E
issue the PBX transfer code #7 before dialing
extension number 1234, then to return to the
Command state before initiating the handshake.
ATDT9W1552368!@#71234;<CR>
instructs the modem to use tone dialing (T), to access
a number outside a PBX (9), to wait for dial tone (W),
to dial the number 1552368, to do a hook-flash (i.e.
timed break recall), to wait for quiet answer, and to
Modi?er
0-9 A B C D # *
P
R
T
W
,
@
!
;
Function
Dialing digits and characters. The digits and characters 0-9 A B C D # * specify what numbers the modem dials.
The characters A B C D # * work only when tone dialing is used, they are ignored when pulse dialing is used. The
characters A, B, C, and D may be disabled in countries prohibiting their use.
Pulse dialing. P selects the pulse method of dialing. P can be issued within a dial command or as a separate
command. The default method of dialing is Pulse.
Originate a Call in Answer Mode. R makes the modem handshake in answer mode so it can originate a call to an
originate-only modem.
Tone dialing. T selects the tone method of dialing. T can be issued within a dial command or as a separate command.
The default method of dialing is Pulse.
Wait for dial tone. W makes the modem wait for a dial tone before proceeding. If no dial tone is detected the modem
hangs up the telephone line and returns the NO DIALTONE result code.
Delay Processing of Next Character. A comma (,) makes the modem pause for the length of time in Sregister S8
before processing the next character in a dial string.
Wait for Quiet Answer. @ makes the modem listen for 5 seconds of silence before continuing. The modem will wait
up to the length of time in S-register S7. If 5 seconds (con?gurable by country) of silence are not detected within the
time period in S-register S7, the modem hangs up and returns the NO ANSWER result code. If 5 seconds of silence
are detected, the modem continues processing the other characters in the dial string.
Timed Break Recall (Hook?ash). A ! makes the modem hang up the telephone line for the length of time in S-register
S29, then take the telephone line off hook again. This is frequently used to access a PBX’s call transfer function.
Return to Command State after dialing. A semicolon (;) tells the modem to return to command state after dialing
without breaking the telephone line connection and without handshaking with the other modem. The semicolon may
only be used when calling a voice mail system that permits tones to transmit numbers once a connection has been
established.
R03
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