# Configuring QuestBlue Register Authentication Trunk

Before proceeding with the next steps, ensure that at least one DID has been [purchased on the QuestBlue platform](/portsip-communications-solution/configuring-sip-trunks/questblue-sip-trunk/purchase-a-did-on-questblue-platform.md).

### Create a SIP Trunk on the QuestBlue Platform

To create a new SIP trunk on the QuestBlue platform, follow these steps:

1. **Sign in** to your QuestBlue account.
2. From the left-hand navigation menu, select **SIP Trunks > Trunks**.
3. Click **Add Trunk**.
4. Enter a **friendly name** for the trunk (for example, `PortSIP-Trunk`).
5. For **Trunk Type**, select **Static IP Trunk**.
6. For **Trunk Region**, choose the appropriate location.
   * Note the **SBC domain** for the selected region. QuestBlue typically recommends using `sbc.questblue.com`.
7. For **Max Channels**, leave the default value unless your service plan requires a different setting.
8. In the **IP Address** field, enter the **public static IP address of your PortSIP PBX**, then click **Create Trunk**.

<figure><img src="/files/Q9ACEmMoB5ktFLWjbsIl" alt=""><figcaption></figcaption></figure>

After the SIP trunk is successfully created, it will appear in the **SIP Trunks > Trunks** list in your QuestBlue account and will be ready to use in PortSIP PBX configuration.

<figure><img src="/files/JloaOYeL5qxGx6NazKtE" alt=""><figcaption></figcaption></figure>

***

### Retrieve the Trunk Password

To retrieve the password for a SIP trunk on the QuestBlue platform, follow these steps:

1. Go to the **Trunks** list page.
2. Click the **Edit (pencil)** icon next to the trunk.
3. Copy and securely record the **trunk password** displayed on the configuration page.

<figure><img src="/files/HrYKlsYxt4fDGNjEnaMs" alt=""><figcaption></figcaption></figure>

***

### Assign a DID to a SIP Trunk

To assign a DID number to a SIP trunk, follow these steps:

1. Navigate to **Telephone Numbers > Telephone Numbers**.
   * All active DID numbers will be displayed.
2. Click the **Edit (pencil)** icon next to the DID you want to assign.
3. In the pop-up window, select the desired SIP trunk from the **Trunk** drop-down list.
4. Click **Submit** to save the changes.

You can repeat these steps to assign additional DIDs as needed.

***

### Configure a Register-Based Trunk in PortSIP PBX

The **QuestBlue Registration Trunk** corresponds to a **Register-Based Trunk** in PortSIP PBX.

You can configure a Register-Based Trunk at **either** of the following levels:

* **System Administrator level**
  * The trunk can be **shared with one or more tenants**.
* **Tenant Administrator level**
  * The trunk can be **used only by that tenant** and cannot be shared.

***

#### Step 1: Create the Register-Based Trunk

1. Sign in to the PortSIP PBX Web Portal as a **System Administrator** or **Tenant Administrator**.
2. From the left-hand navigation menu, go to **Call Manager > Trunks**.
3. Click **Add**, then select **Register Based Trunk**.

<figure><img src="/files/dvJjzdHP0zLdeNfvozXe" alt=""><figcaption></figcaption></figure>

***

#### Step 2: Configure Basic Trunk Settings

Enter the following information:

* **Name**\
  Enter a friendly name for the trunk (for example, `QuestBlue-Reg-Trunk`).
* **Brand**\
  Select **QuestBlue**.
* **DID Pool** *(Tenant Admin level only)*\
  If you are configuring this trunk at the **Tenant Administrator level**, specify the QuestBlue DID numbers assigned to this tenant.

The tenant can use **only the DID numbers in its DID pool** to:

* Create inbound and outbound call rules
* Configure outbound caller IDs for extensions

<figure><img src="/files/2VxgZPPBB6ZWjn5b9Ls0" alt=""><figcaption></figcaption></figure>

**DID Pool Format Examples**

The DID pool may include a single number, multiple numbers, ranges, or a combination. Use a semicolon to separate them:

```
16468097065
16468097065;16468097066
16468097065-16468097066;16468097069
16468097065-16468097066;16468097070-16468097080
```

Click **Next** to continue.

***

#### Step 3: Configure Trunk Credentials

Enter the credentials provided by QuestBlue:

* **Authentication Name**\
  Enter the QuestBlue trunk username specified when creating the SIP trunk on the QuestBlue platform\
  (for example, `portsipRegUser`).
* **Password**\
  Enter the trunk password retrieved earlier from the QuestBlue platform.

Click **Next** to continue.

<figure><img src="/files/zgK2mJh53Bx00jvJYKh9" alt=""><figcaption></figcaption></figure>

***

#### Step 4: Configure Call Capacity and Options

* **Max Concurrent Calls**\
  Specifies the maximum number of simultaneous calls that PortSIP PBX can establish using this trunk.
  * Adjust this value based on your QuestBlue service plan and expected call volume.
  * For most deployments, the default value is sufficient.

Leave all other settings at their default values unless you have specific requirements.

Click **Next** to continue.

<figure><img src="/files/pMzGnd89J2nQf65l7qPQ" alt=""><figcaption></figcaption></figure>

***

#### Step 5: Assign Tenants and DID Pool *(System Admin level only)*

> ❗**Note**\
> This step is available **only** when configuring the Register-Based Trunk at the **System Administrator level**.

1. Assign the trunk to one or more tenants.
2. Provide QuestBlue DID numbers to each tenant using the **DID Pool**.

> ❗**Important**
>
> * Each DID can be assigned to **only one tenant**.

A tenant can use **only the DID numbers in its assigned DID pool** to:

* Create inbound and outbound call rules
* Configure outbound caller IDs for extensions

<figure><img src="/files/aNIDVej6QNhfrUNs448F" alt=""><figcaption></figcaption></figure>

**DID Pool Format Examples**

```
16468097065
16468097065;16468097066
16468097065-16468097066;16468097069
16468097065-16468097066;16468097070-16468097080
```

Click **OK** to save the configuration.

***

#### Expected Result

* The trunk configuration is now complete.
* Once PortSIP PBX successfully registers to the QuestBlue platform, the trunk status will display **Registered** on the trunk list page.

<figure><img src="/files/fwEGcBhOWLmMbeWRKYDu" alt=""><figcaption></figcaption></figure>

You can now proceed to [configure inbound and outbound call routing rules](/portsip-communications-solution/configuring-sip-trunks/questblue-sip-trunk/configuring-outbound-and-inbound-calls.md) using the QuestBlue Register-Based trunk.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://support.portsip.com/portsip-communications-solution/configuring-sip-trunks/questblue-sip-trunk/configuring-questblue-register-authentication-trunk.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.