> ## Documentation Index > Fetch the complete documentation index at: https://docs.fluents.ai/llms.txt > Use this file to discover all available pages before exploring further. # Numbers > Numbers are the phone lines your Fluents.ai agents use to send and receive calls. Learn how buying, linking, and tagging numbers fits into your overall setup. Numbers are the **phone lines** your Fluents.ai agents use to: * Receive inbound calls from your customers * Place outbound calls in campaigns * Control which caller ID your contacts see Depending on your setup, you can either: * **Buy new numbers directly in Fluents.ai**, or * **Link existing numbers** that you already own with a telephony provider. *** ## How numbers fit into Fluents.ai Numbers sit between your **customers** and your **agents**: * For **inbound calls**:\ Customers dial a number → Fluents.ai receives the call → your **inbound agent** answers. * For **outbound campaigns**:\ Your **campaign** uses one or more numbers to call a list of contacts → the caller ID they see is the number you chose. You can: * Own numbers fully inside Fluents.ai (when you buy numbers) * Reuse numbers you already have with external providers (when you link numbers) * Organize numbers with **tags** so you can easily assign the right ones to agents and campaigns *** ## Numbers list view In the **Numbers** section, you’ll see all phone numbers available for your account. Typical columns include: * **ID** – Internal identifier for the number. * **Number** – The phone number itself. * **Agent** – The inbound agent currently assigned to this number (if any). * **Telephony provider** – For example, Fluents, Telnyx, or Twilio. * **Account connection** – Which provider account the number belongs to (when applicable). * **Tags** – Any tags you’ve added to group this number (for example, `sales-us`, `after-hours`). At the top of the page you can: * **Search numbers** – Quickly find a specific number by searching its digits. * **Filter by tags** – Show only numbers that match one or more tags. This makes it easy to locate the right number when assigning agents or configuring campaigns. *** ## Buying vs. linking numbers Fluents.ai supports two main ways to add numbers to your account. ### 1. Buying numbers in Fluents.ai (US only) Use this when you **do not have your own telephony provider** and want Fluents.ai to handle the phone line for you. * Currently, you can buy **US phone numbers** directly in Fluents.ai. Typical flow: * Click **New** in the Numbers page. * Choose the **Fluents** provider (or built‑in option, depending on your UI). * Pick an available US number. * Add the number to your account. * Optionally assign an **inbound agent** and **tags** as part of the setup. Good for: * Setting up dedicated inbound lines (for example, Support, After‑hours, Sales). * Having clean caller IDs for outbound campaigns. * Getting started quickly without creating accounts at external providers. *** ### 2. Linking existing numbers you already own If you already have phone numbers with a telephony provider (for example, Telnyx or Twilio), you can **link** those numbers to Fluents.ai. Linking is simple: * In the **Numbers** page, use **Link Existing** (or the equivalent action). * Enter the **phone number** you want to link. * Fluents.ai validates and, if everything looks good, adds that number to your list. * Optionally assign an **inbound agent** and **tags** when you link it. You are not searching an inventory inside Fluents.ai here—you are telling Fluents “use this number I already own with my provider”. Good for: * Teams who already use Telnyx, Twilio, or another provider and don’t want to change numbers. * Preserving existing phone numbers that customers already know. * Gradually migrating from manual or legacy phone workflows to AI agents. *** ## Assigning numbers to agents (inbound) To **receive inbound calls**, a number must be linked to an **inbound agent**. Conceptually: * **Number** = the phone line customers dial. * **Agent** = what answers the phone and handles the conversation. Typical usage: * Main business line → reception or routing agent. * After‑hours line → after‑hours agent. * Support line → support triage agent. In the **New Number**, **Link Existing**, or **Edit** modal you can: * Set the **Inbound Agent** for that number. * Change the assignment later if your workflows change. You can assign: * One number to one inbound agent. * Multiple numbers to the same agent (for example, regional numbers that all route to the same agent). *** ## Using numbers in campaigns (outbound) For **outbound campaigns**, numbers are used as the **caller ID** your contacts see. You can: * Choose which specific number (or pool of numbers) a campaign should use. * Use different numbers for different regions, brands, or purposes. * Reuse the same number across multiple campaigns when appropriate. This is where **tags** become especially helpful. *** ## Organizing numbers with tags Tags let you **group and filter numbers** so you can easily assign the right ones to agents and campaigns. Examples of tags: * `inbound-support` * `after-hours` * `sales-us` * `sales-eu` * `clinic-a`, `clinic-b` (for multi‑location businesses) How tags help: * When creating a **campaign**, you can choose numbers by tag (for example, use all `sales-us` numbers). * In the **Numbers** page, you can filter by tag to see subsets of numbers (for example, all after‑hours lines). * When assigning numbers to **inbound agents**, tags can help you find the right set quickly. Tags are **free‑form**: you can create as many as you need directly in the number modal and reuse them across numbers. *** ## Typical number strategies Here are a few simple patterns that work well: ### Inbound after‑hours agent * Buy or link a dedicated **after‑hours number**. * Tag it `after-hours`. * Assign it to your **after‑hours inbound agent**. * Optionally use the same tag when filtering or reporting. ### Outbound sales campaign * Buy or link **several local numbers** for a region (for example, US East). * Tag them `sales-us`. * In your **outbound sales campaign**, choose numbers with the `sales-us` tag. * Your contacts see a familiar local caller ID, while the campaign manages pacing and retries. *** ## Where to go next * See how campaigns use numbers in\ **[Campaigns](./campaigns)** * Learn how to configure and manage numbers step‑by‑step in the\ **[Numbers Feature Guide](../features/numbers)** * Explore real workflows that combine numbers, agents, and campaigns in the\ **[Use Cases & Tutorials](../quickstart/index)**