Zypcom Z34-PC, User Manual

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Appendix B-5
B
+VRA=n
Ringback-goes-away timer. Command selects the
length of time modem waits between ringbacks before
the DCE assumes the remote party has gone off-hook.
Default is 50. Each increment is .1 seconds; therefore,
default of 50 is 5.0 seconds. Range is 0-50.
+VRN=n
Ringback-never-appeared timer. This command sets
length of time modem waits for ringback when
originating a call in voice mode. If timer times out, an
ERROR message is sent. If ringback is detected before
timeout, an OK is sent. Default is 10 (seconds). Range
is 0-255.
+VRX
Record mode. This command causes the modem to
enter record mode to record voice messages.
+VSD=m
Silence detection. This command allows the DTE to set
two parameters: <sds> which reports the sensitivity for
silence detection, and <sdi> which reports the length of
silence detected. The format is m=<sds>,<sdi>. Default
is 128,50. The <sds> range is 121 to 131. The <sdi>
range is 0 to 255 (.1 seconds), with 0 disabling the
silence detection.