Digital Modem Installation Guide

44 AT commands
CTA 500 dm On Line Guide P0873832 Issue 05
Call Control
Call Control Commands are associated with making calls through
the CTA 500dm. They are also understood by most computer
software.
Call Control commands summary
Dial Command
The Dial Command
D[dial string][;]
instructs the CTA 500dm to originate a call.
The dial string consists of characters, up to the end of the line or to
the optional; character. The dial string stored in location 0 is used if
no characters follow the D command; an error is returned when there
is no stored dial string.
Command Description Value
Dx originate a call valid dial string or strings
A answer a call
H disconnect from
current call
Character Use
0-9 dialed digits
p or P ignored (or may be used to force dial a speech bearer
service call)
t or T ignored (or may be used to force dial a 3.1 kHz audio bearer
service call)
, or - ignored, used as separators or for formatting
! hook flash
w or W wait (the CTA 500
dm does not perform dial tone detection, so
it will wait for 2 seconds)
, pause in dialing
& dial string separator; used for applications that need multiple
numbers to dial