---
title: "NRUF Sub-Categories"
slug: "nruf-sub-categories"
updated: 2026-08-10T20:13:39Z
published: 2026-08-10T20:13:39Z
canonical: "help.idibilling.com/nruf-sub-categories"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.idibilling.com/llms.txt
> Use this file to discover all available pages before exploring further.

# NRUF Sub-Categories

NRUF sub-categories are additional system-defined categories that further define the status of certain service numbers. The following is a list of NRUF sub-categories provided by the system with the inventory status and NRUF category that corresponds to each sub-category:

| **NRUF Sub-Category** | **Inventory Status** | **NRUF Category** | **Description** |
| --- | --- | --- | --- |
| Soft Dial Tone Numbers | Administrative | Administrative | Service number only allows restricted dialing, such as only being able to call emergency services. |
| Ported-Out Numbers | Ported-Out | Assigned | Service number belongs to your company, but is assigned to a customer that utilizes a different carrier. NRUF Sub-Category is automatically set to Ported-Out Numbers when a service number's inventory status is set to Ported-Out. |
| Dealer Number Pool | Intermediate | Intermediate | Service number belongs to your company, but is allocated to a retail dealer to sell on your company's behalf. |
| Test Numbers | Administrative | Administrative | Service number is only used for network testing purposes. |
| Employee / Official Numbers | Administrative | Administrative | Service number is used internally by your company. |
| Local Routing Numbers | Administrative | Administrative | Service number is assigned to a switch for routing purposes in a permanent local number portability environment. |
| Temporary Local Directory Numbers | Administrative | Administrative | Service number is assigned by a wireless provider to a roaming subscriber, on a per-call basis, for incoming call setup purposes. |
| ESRD/ESRK | Administrative | Administrative | Service number is used to route E911 calls to the correct PSAP (Public Safety Answering Point), when the call originates from a wireless switch. |
| Intermittent Numbers | Assigned | Assigned | Service number is not always in service, but is always assigned to the same customer. |