Create a PSTN Trunk

To create a PSTN trunk in the PBX, you need to install the O2 module or SO module.

1. Install O2 module or SO module.
   1. Power off the PBX.
   2. Open the upper case of the PBX.
   3. Place the O2 module or SO module above the main board, slowly insert each pin into right slot.
2. Use a RJ11 phone line to connect the FXO port of PBX and the PSTN provider's FXS port.
3. Log in the PBX web interface, go to PBX Monitor > Trunks to check the trunk status.

   If the trunk status shows , the trunk is ready for use. For more information on trunk status, see PSTN/FXO Trunk Status.

4. Go to Settings > PBX > Trunks, configure the basic settings of the PSTN trunk.
   • Name: Give this trunk a name to help you identify it.
   • RX Volume: Set the receiving volume of the FXO port.
   • TX Volume: Set the transmitting volume of the FXO port.

   

5. Configure other PSTN trunk settings as your need.
6. Click Save and Apply.