IBM 2196 - Manual (Page 172)

B-6 IBM Personal Computer User Guide
AT commands
Table 1: AT commands
Command Function
A Answers incoming call
A/ Repeats the last command given. Note: Do not precede by AT or follow by
Enter
D 0-9, A-D, # and *
L = last number redial
P = pulse dial
T = tone dial
W = wait for second dial tone
V = switch to speakerphone mode
, = pause
@ = wait for five seconds of silence
! = flash
;= return to command mode after dialing
E0 Commands echo disabled
E1 Commands echo enabled
+++ Escape characters - switch from data mode to command mode
H0 Modem on-hook (hang-up)
H1 Modem off-hook (make busy)
I0 Firmware and device ID
I1 Checksum code