---
title: "System Settings: System Tables - Number Management"
url: "https://help.psarev.io/en/article/system-settings-system-tables-number-management"
language: "en"
last_updated: "2026-10-08T18:44:14.397Z"
---

# System Settings: System Tables - Number Management

The *System Tables* category on the System Settings screen allows you to configure various data points that can be selected using dropdown menus throughout your database. The *Number Management* tab controls the reasons a telephone number can be marked unavailable and how long the number is held in quarantine after removing it from a service. To open it, click **Admin** in the sidebar menu, select **System Settings**, click **System Tables**, and then click the **Number Management** tab.

![](https://cdn-assets.productfruits.com/e71aa18d-a1e5-4067-8dd3-2ead062f14d8)

Each column in the *Unavailable Reason* section is defined below.

| No. | Label | Definition |
| --- | --- | --- |
| 1 | **Reason** | The name of the reason a number can be marked unavailable, such as Quarantine Hold or Ported Out. This reason can be selected when removing numbers from recurring services. |
| 2 | **Hold Days** | The number of days a number is held after it is marked unavailable for this reason. This is considered a quarantine period so if you remove a number from one customer's account, there is typically a hold period before you can re-assign that number to a new customer account. The number will not show as available until that hold period has passed in order to prevent assigning the number before the quarantine period is up. |

These actions are available on the *Number Management* tab.

-   Add a new reason by clicking the **Add Unavailable Reason** button, completing the fields, and saving.
-   Search the reasons by selecting a column from the dropdown next to the **Search** box (set to **Reason** by default) and entering text.
-   Sort the reasons by clicking the column label in the table header.
-   Edit a reason by clicking the three-dot menu at the end of its row and selecting **Edit**.
-   Delete a reason by clicking the three-dot menu at the end of its row and selecting **Delete**.

See the [System Settings: Overview](https://help.psarev.io/en/article/system-settings-overview) article for more information about the other categories on the System Settings screen.

**Related Articles**

-   [Number Management: Overview](https://help.psarev.io/en/article/number-management-overview)
-   [Number Management: Group Details](https://help.psarev.io/en/article/number-management-group-details)
-   [Assiging Telephone Numbers to Recurring Services](https://help.psarev.io/en/article/assigning-telephone-numbers-to-recurring-services)
-   [System Settings: System Tables - Overview](https://help.psarev.io/en/article/system-settings-system-tables-overview)
-   [System Settings: System Tables - Inventory Management](https://help.psarev.io/en/article/system-settings-system-tables-inventory-management)