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    Elastix: Connect a SIP Trunk

    The VoIP Help Page Team·2 min read·Last updated: March 14, 2026

    This article provides a step-by-step guide to configuring a SIP Trunk and outbound routes in Elastix, allowing your Elastix PBX to connect to a hosted PBX for making and receiving calls.

    Scope

    This article outlines how to configure a SIP Trunk between your hosted PBX and an Elastix PBX.

    This article was written using Elastix 2.5.

    Requirements

    NOTE: This article was written using an IP-based SIP trunk

    Configure SIP Trunk

    1. 1

      Using Internet Explorer, log in to the Elastix instance with admin credentials.

    2. 2

      Navigate to PBX.

    3. 3

      Under the Basic group, select Trunks.

    4. 4

      Click Add SIP Trunk.

    5. 5

      Trunk Name: Enter a descriptive name for the trunk.

    6. 6

      Outbound Caller ID: "<CID Name>" <CID Number>

    7. 7

      Leave Dialed Number Manipulation Rules empty and proceed to Outgoing Settings.

    8. 8

      Trunk Name: pbx-out

    9. 9

      PEER Details: Copy and paste the code below, replace <Domain> with the full domain name and <Core> with the closest geographical core. If unsure, contact support.

      • ATL: sbc.ucaasnetwork.com
      • NYJ: sbc-ne.ucaasnetwork.com
      • SJE: sbc-west.ucaasnetwork.com
      type=peer
trustrpid=yes
session-timers=refuse
rfc2833compensate=yes
qualify=no
outboundproxy=<Core>
nat=no
insecure=port,invite
host=<Core>
fromdomain=<Domain>
dtmfmode=rfc2833
disallow=all
context=from-pstn
canreinvite=no&no
allow=ulaw,alaw

    10. 10

      Under Incoming Settings, set USER Context to pbx-in.

    11. 11

      USER Details: Copy and paste the code below, replace <Domain> with the full domain name and <Core> with the closest geographical core. If unsure, contact support.

      • ATL: sbc.ucaasnetwork.com
      • NYJ: sbc-ne.ucaasnetwork.com
      • SJE: sbc-west.ucaasnetwork.com
      type=user
outboundproxy=<Core>
host=<Core>
fromuser=<Domain>
fromdomain=<Domain>

    12. 12

      Click Submit Changes.

    13. 13

      Click Apply Config.

    Configure Outbound Routes

    1. 1

      Under the Basic group, select Outbound Routes.

    2. 2

      Route Name: Enter a descriptive name for the route.

    3. 3

      Route position: First before 9_outside.

    4. 4

      Under Dial Patterns that will use this route, add a match pattern for XXXXXXXXXX.

    5. 5

      Add an additional pattern for 1XXXXXXXXXX.

    6. 6

      To enable international calling, add a pattern for 011.

    7. 7

      Set Trunk 0 to follow the previously created trunk.

    8. 8

      Click Submit Changes.

    9. 9

      Click Apply Config.

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