Set up an E1/T1/J1 Trunk

This topic describes how to set up an E1/T1/J1 trunk on Yeastar P-Series PBX System.

Background information

ISDN uses circuit-switching to establish a physical permanent point-to-point connection from the source to the destination. ISDN has standards defined by the ITU that encompasses the OSI bottom three layers of which are Physical, Data Link, and Network.

To set up an E1/T1/J1 trunk, you need to make sure both the Physical layer and the Date Link layer run properly.

Prerequisites

  • E1/T1/J1 trunk is only supported on Yeastar P560 and P570.
  • Install at least one EX30 expansion board on the PBX.
  • Prepare an E1/T1/J1 crossover cable.
  • Gather signalling information of the E1/T1/J1 trunk from the ISDN carrier, such as the following information.
    • Carrier type
    • Signalling type
    • Line coding Mechanism
    • Framing Mode
    • D-Channel
    • B-Channel

Procedure

  1. Connect one end of E1/T1/J1 cable to the E1/T1/J1 port on the PBX, and connect the other end of the cable to the ISDN provider's equipment.
  2. Check if the trunk is successfully connected to the PBX on the Physical layer.

    Log in to PBX web portal, go to Extension and Trunk > Trunk to check the E1/T1/J1 trunk status.

    • If the trunk status shows or , the physical layer of this trunk is correct.
    • If the trunk status shows , the physical layer of this trunk is incorrect, check the cable or contact Yeastar support to solve it.
  3. Configure the E1/T1/J1 trunk settings to make the Data Link layer up.
    1. Go to Extension and Trunk > Trunk, edit the desired E1/T1/J1 trunk.
    2. On the Basic page, configure the required settings according to the parameters that are provided by the ISDN carrier.
    3. Optional: Configure other settings of the E1/T1/J1 trunk according to the carrier's requirements.

      For more information of the E1/T1/J1 trunk information, see E1/T1/J1 Trunk Settings.

    4. Click Save.
    5. Reboot the system to take effect.

Result

Go to Extension and Trunk > Trunk to check the trunk status on the trunk list page.

If the status shows , the trunk is ready for use.

For more information of E1/T1/J1 trunk status, see E1/T1/J1 Trunk status.

What to do next

  • To receive inbound calls through the trunk, you need to select this trunk to one or more inbound routes. For more information, see Set up an Inbound Route.
  • To make outbound calls through the trunk, you need to select this trunk to one or more outbound routes. For more information, see Set up an Outbound Route.