Specifications

Si2457/34/15/04
32 Rev. 1.3
&X1
Automatic determination of telephone line type.
Result code: WXYZn
W: 0 = line supports DTMF dialing.
1 = line is pulse dial only.
X: 0 = line supports 20 pps dialing.
1 = line supports 10 pps dialing only.
Y: 0 = extension network present (PBX).
1 = outside line (PSTN) connected directly.
Z: 0 = continuous dialtone.
1 = make-break dialtone.
n: 0–9 (number required for outside line if Y = 0).
Note: The initial number attempted for an outside line is controlled in S51.
&X2
Same as &X1, but Y result (PBX) is not tested.
*
Y2A
Produce a constant answer tone (ITU-T) and return to command mode. The answer tone continues
until the ATH command is received or the S7 timer expires.
&Z
Enter low-power wake-on-ring mode.
Table 9. Extended AT& Command Set (Command Defaults in Bold) (Continued)
Command Action