S-Series IP PBX Administrator Guide
35
Trunks
Yeastar S-Series supports FXO trunk, BRI trunk, GSM/CDMA/3G trunk and VoIP trunk. In this
chapter, we give a simplified guide of setting up trunks.
FXO Trunk
FXO trunk is also known as PSTN trunk. The public switched telephone network (PSTN) is the
network of the world's public circuit-switched telephone networks.
To extend FXO trunk on the system, you need to insert O2 module to S-Series. Go to
Settings >
PBX > Trunks
to edit the FXO trunk. Before configuring a FXO trunk, please make sure that the
analog line is connected to S-Series FXO port.
Click
to edit the FXO trunk. Please check the FXO trunk configuration parameters below.
1) Basic Settings
Table 5-1 FXO Trunk Configuration Parameters
– Basic
General
Trunk Name
Give this trunk a name to help you identify this trunk.
Rx Volume
Set the receiving volume of FXO port or choose Custom to define the RX gain
below.
RxGain
The RX Gain for the receiving channel of FXO Port. The valid range is -30db
to 12db.
Tx Volume
Set the transmitting volume of FXO port or choose Custom to define the TX
gain below.
TxGain
The TX Gain for the transmitting channel of FXO Port. The valid range is
-30db to 12db.
2) Hangup Detection
Hangup detection settings help the system to detect if a call is hung up. If you find the PSTN call
could not be disconnected, these settings need to be configured.
Table 5-2 Hangup Detection Configuration Parameters
Option
Description
Hangup Detection Method
Detect if a call is hung up with one of the following methods:
Busy Tone: listen for a busy tone to detect if the line got hung
up.
