Appendix F – Modem AT Commands
Multi-Tech Systems, Inc. MultiAccess ACS User Guide
56
Command: +VDR=x,
y Distinctive
Ring
Report
Values:
x = 0, 1 Distinctive Ring report control. See description.
y = 0–255 Minimum ring interval in 100 ms units. See description.
Default:
0,
0
Description:
Enables reporting of ring cadence information to the DTE and specifies the minimum
ring cadence that will be reported.
The report format is one line per silence period and one line per ring period. The
length of the silence period is in the form DROF=number in units of 100
ms<CR><LF>, and the length of the ring is in the form DRON=number in units of 100
ms<CR> <LF>. The modem may produce a Ring event code after the DRON
message if enabled by the y parameter. The y parameter must be set to a value equal
to or smaller than the expected ring cadence in order to pass the report to the DTE.
+VDR=0, N/A
Disables Distinctive Ring cadence reporting.
+VDR=1, 0
Enables Distinctive Ring cadence reporting. Other call progress
result codes (including RING) are reported as normal.
+VDR=1, >0
Enables Distinctive Ring cadence reporting. The RING result code
is reported after the falling edge of the ring pulse (i.e., after the
DRON report).
+VDR=?
Displays
the
allowed
values.
+VDR?
Displays the current value.