Polycom VSX Series - Manual (Page 81)

Configuring Network Use
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4. Select and configure these settings:
Setting Description
ST Lets you specify the signaling required by the external
device connected to the system. Specify normal or
inverted, as appropriate. In most cases, normal signaling
is appropriate.
RT
RTS
CTS If your system is connected to Ascend equipment, you
may need to set CTS to Ignore.
DSR
DCD
DTR
Answer on DSR Specifies that the system should begin the call when it
detects a DSR signal.
Delayed DCD
Hangup Specifies how long the system waits to end the call after
a DCD signal is lost (for example, during a call via
satellite).
DTR Pulse Duration
(secs) Specifies how long the DTR signal goes low after the far
site hangs up. When the pulse is too short, the call may
not clear.
If your system is connected to ADTRAN equipment, you
may need to adjust DTR pulse duration.
Trigger Call on H.320
Data Specifies whether the call starts when H.320 data is
detected at the V.35 interface while set for direct
connect.