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Configuring Vonage IP Authentication Trunk

Before proceeding with the next steps, you need to purchase a DID on the Vonage platform.

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Create a SIP Trunk on the Vonage Platform

You can also refer to the official Vonage documentationarrow-up-right for additional details on SIP trunk configuration.

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Step 1: Create a New SIP Trunk

  1. Sign in to the Vonage Dashboard.

  2. Navigate to Build & Manage > SIP.

  3. By default, Vonage provides a pre-created SIP trunk.

    • You may click the Settings icon to modify it, or

    • Click Create New to create a new SIP trunk.

  4. In this guide, we will create a new SIP trunk.

  5. Click Create New, enter a domain name for the trunk (for example, portsip), and then click Create.

  1. Once the SIP trunk is successfully created, you are automatically redirected to the Trunk Details page.

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Step 2: Configure Outbound Calling (IP Authentication)

  1. On the Trunk Details page, locate the Outbound Calling section.

  2. Click Add Authentication. You will be redirected to the Authentication page.

  3. Under Access Control List (ACL):

    • IP Address: Enter your PortSIP PBX static public IP address

    • Range: Enter 32 (single IP address)

  4. Save the configuration.

  1. The Access Control List (ACL) section will appear enabled (green), indicating that IP-based authentication is active.

    Important

    • ACL (IP authentication) and User Key / Secret authentication are mutually exclusive.

    • If you enable ACL authentication, do not configure a User Key and Secret, as both methods cannot be enabled at the same time.

  1. Click Back to return to the Trunk Details page.

On the Trunk Details page, Outbound Calling should now be displayed as Ready.

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Step 3: Note the Vonage SIP Trunk Domain

On the Trunk Details page, copy and save the Vonage SIP trunk domain. Choose the domain closest to your PortSIP PBX location for optimal latency:

  • portsip.sip-us.vonage.com

  • portsip.sip-eu.vonage.com

  • portsip.sip-ap.vonage.com

You will need this domain when configuring the SIP trunk in PortSIP PBX.

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Step 4: Configure Inbound Calling (SIP URI Routing)

To allow Vonage to route inbound calls to your PortSIP PBX, you must configure a SIP URI.

  1. In the Inbound Calling section, add a new SIP URI with the following parameters:

    • Priority Enter a unique value between 0 and 100 (for example, 1).

      • 0 is the highest priority

      • Each URI must have a unique priority value

      Note If priority values are not unique, Vonage cannot guarantee call routing order.

    • URI Enter your PortSIP PBX public IP address or domain name, for example:

      • 44.242.60.185

      • pbx.portsip.com

    • Timeout Set a timeout value between 2000 ms and 20000 ms.

      • If left blank, Vonage uses the default timeout of 5000 ms.

    • TLS (Optional)

      • Enable this option if your PortSIP PBX is configured to receive SIP signaling over TLS.

      • By default, Vonage sends TLS traffic to port 5061.

      • If your PortSIP PBX listens on a different TLS port (for example, 5063), include it in the URI:

    • SRTP (Optional)

      • Enable this option to allow secure media encryption (SRTP).

      • This is recommended when using TLS for SIP signaling.

  1. Click the + button to add the SIP URI. The SIP URI is displayed in the Inbound Calling section, indicating that inbound call routing is configured.

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Step 5: Link Phone Numbers to the SIP Trunk

  1. In the Link Numbers section:

    • Click Link all… to associate all available numbers, or

    • Click Link to select specific numbers.

  2. If no numbers are available:

    • Click Buy Numbers, which redirects you to the Vonage number purchasing portal.

  3. In the Numbers Dashboard, you can filter, link, or unlink numbers as needed.

  1. Once numbers are successfully linked, Vonage will display a status indicating that the SIP trunk is ready to receive inbound calls.

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Configure an IP Authentication Trunk in PortSIP PBX

In PortSIP PBX, an IP Authentication Trunk refers to an IP-Based Trunk, where calls are authenticated using the source IP address instead of SIP credentials.

You can configure an IP-Based Trunk at either of the following levels:

  • System Administrator level

    • The trunk can be shared across multiple tenants

  • Tenant Administrator level

    • The trunk is exclusive to that tenant and cannot be shared

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Step 1: Create an IP-Based Trunk

  1. Sign in to the PortSIP PBX Web Portal as a System Administrator or Tenant Administrator.

  2. From the left navigation menu, go to Call Manager > Trunks.

  3. Click Add to open the trunk type menu.

  4. Select IP Based Trunk.

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Step 2: Configure Basic Trunk Settings

On the Basic Settings page, configure the following fields:

  • Name Enter a friendly and descriptive name for the trunk (for example, Vonage-IP-Trunk).

  • Brand Select Vonage.

  • Hostname or IP Address Paste the Vonage SIP trunk domain copied earlier, for example:

  1. Click Next to continue.

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Step 3: Configure Trunk Options

On the Options page:

  • Max Concurrent Calls Set the maximum number of simultaneous calls allowed on this trunk.

    • This value should align with your Vonage service limits and expected call volume.

  • Other Options Keep the default values unless you have specific routing, codec, or interoperability requirements.

Recommendation For most deployments, the default options provide optimal compatibility and stability.

  1. Click Next to proceed.

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Step 4: Assign Tenants and Configure DID Pool

This step appears only when configuring the trunk at the System Administrator level. It is not available when the trunk is created at the Tenant Administrator level.

  1. Assign one or more tenants that are allowed to use this trunk.

  2. Configure the DID Pool to distribute Vonage phone numbers to tenants.

DID Pool Rules

  • Each DID can be assigned to only one tenant

  • Tenants can:

    • Use only the DIDs in their assigned pool

    • Create inbound and outbound rules using those DIDs

    • Configure outbound caller ID for extensions using those DIDs

DID Pool Format Examples

  • Single number:

  • Continuous range:

  • Multiple entries:

  • Multiple ranges:

  1. Click OK to save the configuration.

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Expected Result:

  • The trunk is successfully created.

  • In the Trunks list, the status appears as Online.

Note For IP-Based Trunks, the status always displays as Online. This is expected behavior and does not indicate SIP registration in the traditional sense.

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Next Steps

The Vonage IP Authentication Trunk is now ready for use.

You can proceed to:

  • Configure outbound call routing rules

  • Configure inbound DID routing

  • Assign outbound caller IDs

Refer to the next guide section: Configuring Outbound & Inbound Calls.

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