ZyXEL Communications 2864 Series User Manual page 192

The DCE returns the VCON result code (returns OK if S48.5=1) if the DCE ac-
cepts this command, or it returns the ERROR result code if the <device> value is
not permitted.
• AT+VLS?
The DCE will return the current I/O device followed by the OK result code.
• AT+VLS=?
The DCE will return permitted I/O devices. The response is:
0,1,2,8,16
OK
• AT+VRA=<interval>
The DCE only uses this command in a call origination transaction. This command
sets the amount of time the DCE shall wait between ringbacks before the DCE can
assume that the remote station has gone off-hook. The default value is 70 (7 sec-
onds). The range of <interval> is from 0 to 255. The units are 0.1 seconds. A value
of zero forces the DCE to return the OK result code immediately after the first ring-
back.
The <interval> subparameter refers to the silence interval length between the end of
one ring interval and the start of the next ring interval. The DCE returns the OK re-
sult code if the DCE accepts this command, or it returns the ERROR result code if
the <interval> is out of range.
• AT+VRA?
The DCE will return the current Ringback Goes Away Timer interval value, fol-
lowed by the OK result code.
• AT+VRA=?
The DCE will return the permitted interval of the Ringback Goes Away Timer. The
response is:
0-255
OK
• AT+VRN=<interval>
The DCE only uses this command in a call origination transaction. This command
sets the amount of time the DCE will wait looking for a ringback. If the DCE does
not detect a ringback within this time period, the DCE assumes that the remote
station has gone off-hook, and returns an OK result code.
A +VRN setting higher than the value in the S7 register means that only the S7
timer is in effect. The range of <interval> is from 0 to 255. The unit is 1 sec-
ond. The default value is 10 (10 seconds). A value of zero forces the DCE to return
OK immediately after dialing.
16–16