IPitomy IP400 User Guide - Manual (Page 21)

Setup
13
Ring frequency
Max The maximum ring frequency for the FXO port to detect.
Ring Validation
Time Select the time for the FXO port to detect a valid ring.
Ring Indication
Delay Select the desired value from the list.
Ring Timeout Select the desired option for the ring timeout.
Ring Threshold The minimum voltage level which the incoming ringing signal must
present for the VoIP Gateway to detect it.
Ringer Impedance Choose the desired value to satisfy the maximum ringer impedance
specification.
Battery reversal as
disconnect signal Select this radio button if you want the VoIP Gateway to deem
battery reversal as line disconnection signal.
Loop period shut-
down as disconnect
signal Select this radio button if you want the VoIP Gateway to deem loss
of loop as line disconnection signal
Minimum period
for disconnect
signal Enter the desired value in milliseconds.
Tear down FXO
port when silence
detected for Enter the time when an FXO port detects no RTP packets before
hanging up the port.