Create a SIP Register Trunk

This topic gives a configuration example to describe how to create a general SIP Register Trunk, which can be applied to all kinds of SIP Register Trunk.

Background information

Assume that you have bought a SIP account from the ITSP ABC, and the trunk information is displayed as below.

  • Provider domain:
  • Protocol: SIP
  • Registration Port: 5060
  • Transport: UDP
  • Username: 254258255
  • Authentication name: 254258255
  • Password: 05JsOmsIS54SYh


  • You have purchased a SIP account from an ITSP and a username and a password are offered.
  • Your PBX can connect to the ITSP.


  1. Log in to PBX web portal, go to Extension and Trunk > Trunk, click Add.
  2. In the Basic section, configure the following settings:
    • Name: Enter a name to help you identify it.
    • Trunk Status: Select Enabled.
    • Select ITSP Template: Select General.
  3. In the Detailed Configuration section, select the trunk type and enter the SIP information that is provided by the ITSP.
    • Trunk Type: Select Register Trunk.
    • Transport: Select the transport provided by the ITSP. In this example, select UDP.
    • Hostname/IP: Enter the domain name or IP address of the ITSP. In this example, enter
    • Port: Enter the provided registration port. In this example, enter 5060.
    • Domain: Enter the domain in SIP URI of a specific header like From, To header. In this example, enter
      Note: If the domain is not provided by ITSP, enter the same value as Hostname/IP.
    • Username: Enter the provided user name. In this example, enter 254258255.
    • Password: Enter the provided password. In this example, enter 05JsOmsIS54SYh.
    • Authentication Name: Enter the provided authentication name. In this example, enter 254258255.
      Note: In most cases, authentication name is the same as the user name.
    • Enable Outbound Proxy: Optional. If the trunk is configured to use an outbound proxy server, when users make outbound calls through this trunk, all the SIP packets will be sent to the outbound proxy server.
      Note: Contact your ITSP to check if outbound proxy is supported, then configure outbound proxy settings under the ITSP's guidance.
  4. Optional: If you have purchased DID numbers from the ITSP, click DIDs/DDIs tab to configure the DID numbers for the trunk.
    1. Click Add.
    2. In the pop-up window, configure the following settings:
      • DID/DDI: Enter the DID number provided by the ITSP.
      • DID/DDI Name: Optional. Enter a name to distinguish inbound calls by DID numbers.

        The name will be displayed on the called party's device when the DID number is dialed.

    3. Click Save.
    4. To add more DID numbers, repeat step a - c.

    For more information of DID configurations, see Configure DID Numbers on a Trunk.

  5. Optional: Click Advanced, Inbound Caller ID Reformatting, Outbound Caller ID, or SIP Headers tab to configure other settings.
  6. Click Save and Apply.


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

If the status shows , the trunk is registered successfully.

For more information of SIP trunk status, see SIP 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.