Appendix
AT commands
Call control commands
10
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73
EDSMF2181IB EN 3.0
10.3.3 Call control commands
Command: T
Preset dual tone multiplexed frequency dialling
Forces DTMF dialling mode until the next P−dial modifier or P−command is received. The
modem sets an S−parameter bit to indicate that each subsequent dialling process is to take
place in dual tone multiplexed frequency dialling. The DP−command (not described in this
manual) overwrites this command. Deletes S14 bit 5. This command may not be permitted
in some countries. (See P−command).
Command Default
setting
Values defined Result codes
T OK
Command: P
Preset pulse dialling mode
Forces pulse dialling mode until the next T−dial modifier or T−command is received. Sets
S14 bit 5. When a dialling command is executed, expressly specifying a dialling process for
this specific call (e.g. ATDT), this command is overwritten, so that each future dialling
process is executed in dual tone multiplexed frequency dialling. (See T−command). This
command may not be permitted in some countries.
Command Default
setting
Values defined Result codes
P OK
Command: &G
Select guard tone
Induces the modem to generate the guard tone selected by this command (only for
modems with phase−shift−keyed modulation, DPSK). If it is valid, the parameter value is
rewritten to S23 bits 6 and 7. This command may not be permitted in some countries.
Command Default
setting
Values defined Result codes
&G 0
&G0 Deactivates guard tone (default setting).
<value> = 0 to 2
otherwise ERROR
&G1 Deactivates guard tone.
&G2 Selects 1800 Hz guard tone.
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