SIP Trunking

    Yeastar S: Connect a SIP Trunk

    The VoIP Help Page Team·3 min read·Last updated: March 14, 2026

    **Scope**:

    The following steps will allow you to create a SIP Trunk with your hosted PBX for use on the Yeastar S series platform using IP or User based authentication and default inbound and outbound routes.

    Requirements:

    • This has been tested on version s20, 50 and 100
    • Administrator privileges to the web console
    • SIP trunk information ( Create a SIP Trunk )

    Create an IP based SIP Trunk

    Follow this step if the client has a Static IP

    1. 1
      Using Chrome or Firefox navigate to the web interface of the PBX.
    2. 2
      Click on Setting Icon
    3. 3
      Log in with your administrator credentials.
    4. 4
      From the navigation at the left select PBX and then Trunks.
    5. 5
      Click on Add and fill out the following
    6. 6
      Name: Name of the trunk ( Recommended: same name as the trunk name you created )
    7. 7
      Trunk Type : Peer Trunk
    8. 8
      Protocol: SIP
    9. 9
      Hostname/IP: <SBC FQDN>  (ie: sbc.ucaasnetwork.com)
    10. 10
      Domain:  Name of the trunk you created in Manager Portal (Not the domain name the trunk belongs to )
    11. 11
      Transport: UDP
    12. 12
      Leave everything else default
    13. 13
      Click Save
    14. 14
       Follow steps 4 to 5 for the remaining SBC FQDN listed here
    15. 15
      Apply Configuration for the changes to take effect

    Create a User Based Authentication Trunk

    Use this if the client has dynamic ip address.

    1. 1
      Navigate to PBX -> Trunks
    2. 2
      Click Add and fill out the following
    3. 3
      Name: Name of the trunk ( Recommended: same name as the trunk name you created )
    4. 4
      Trunk Type: Register Trunk
    5. 5
      Protocol: SIP
    6. 6
      Transport: DNS-NAPTR
    7. 7
      Hostname: Domain name ( This is the domain name where the trunk is assigned )
    8. 8
      Username:  SIP Username ( Trunk SIP Username)
    9. 9
      Password: SIP Password ( Trunk SIP Password )
    10. 10
      Ensure Enable Outbound Proxy is checked
    11. 11
      Enter your home node SBC FQDN in Outbound proxy server field
    12. 12
      Enter port as 5060
    13. 13
      Click Save
    14. 14
      Apply Configuration for the changes to take effect

    Configure Default Inbound Routes

    1. 1
      Navigate to PBX -> Call Control.
    2. 2
      Click Inbound Routes tab
    3. 3
      Click Add, fill out the following
    4. 4
      Name:  Default Inbound Route ( Something descriptive )
    5. 5
      DID Pattern: Leave default
    6. 6
      Member Trunks: Select all available trunks you created listed in available and click the arrow button to move them to selected window
    7. 7
      Scroll Down to Destination Section and select the treatment
    8. 8
      Hang up, Extension, Voicemail, Extension Range, IVR, Ring Group, Queue, Conference, and External Number
    9. 9
      Click Save
    10. 10
      Apply Configuration for the changes to take effect

    Configure Outbound Routes

    1. 1
      Navigate to PBX -> Call Control
    2. 2
      Click Outbound Routes tab
    3. 3
      Click Add, fill out the following
    4. 4
      Name:  Default Outbound Route
    5. 5
      Dial Pattern: Leave Default
    6. 6
      Member Trunks: Select the SBC Trunks you created and order them by priority based on your home node (ie: sbc-west -> sbc -> sbc-ne )
    7. 7
      Click Save
    8. 8
      Apply Configuration to save changes.

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