Specifications

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Figure 2-16 Trunk line characteristics configuraiton interface
Table 2-20 Configuration parameter of trunk line characteristics
Title Explanation
Gain to IP Set the voice volumn gain towarding IP side, the default is 0. Taking
decibel as the unit, setting range is -3 ~ +9 decibels. -3 means declining
of 3 decibels; +3 denotes the amplification of 3 decibels.
Gain to PSTN Set the voice volumn gain towarding PSTN side, the default is -3.
Taking decibel as the unit, setting range is -6 ~ +9 decibels.
Impedance Set the parameter of FXO line impedance, with the default of 600 ohm.
The optional settings as below:
l Complex
l 600（ohm）
l 900（ohm）
Outplusing delay The time interval between FXO going off-hook and starting outpulsing
the first digit to PSTN. The default is 400 in milliseconds.
Ring relay Whether to relay the ring of inbound call to the FXS port when applying
to DID. The default is “FXS ring independently”.
Busy line handle Either a voice prompt or hanging up can be applied to FXO port when
an incoming call goes to the FXS port which is in busy. This applicable
only to DID feature.
PSTN failover Whether to route a call to PSTN through FXO port when the IP network
faults or no response to the call request. Default selected.
Caller ID detection
mode.
l Mode 1: Detecting caller ID after ring；
l Mode 2: Detecting caller ID before ring；；
l Mode 3: Detecting caller ID before ring；；
l Mode 4: Detecting caller ID after ring；
Inbound first digit
timeout
Set the timeout of calling DTMF on FXO port for inbound calls, ranging
from 10-60 seconds, with default of 24 seconds.
Answer delay Set the delay time of outbound connection ranging from 10-60 seconds,
with default of 12 seconds. Working with “Line >Trunk” interface and
“Connect signal delay” configuration.