How to Assign a Phone Number to Your Microsoft Teams Auto Attendant

November 19, 2025

So, you've got Microsoft Teams set up and you're ready to make it work harder for your business. One of the next steps is getting an auto attendant up and running, which is great for handling calls. But how do you actually give that auto attendant a phone number so people can call in? It's not as complicated as it sounds, and this guide will walk you through how to assign a phone number to your Teams auto attendant. We'll cover the basics and a few different ways to get it done.

Key Takeaways

  • To assign a phone number to a Microsoft Teams auto attendant, you first need a resource account. This account acts as the backbone for your auto attendant.
  • You can assign phone numbers to your auto attendant's resource account through the Teams Admin Center by navigating to Voice > Phone numbers and then assigning the number to the specific resource account.
  • For those who prefer automation or manage many auto attendants, PowerShell offers a way to assign phone numbers to resource accounts using the `Set-CsPhoneNumberAssignment` cmdlet.
  • Before assigning a number, make sure you have the necessary licenses, like a Teams Phone Resource Account license, and that the phone number and resource account's usage location match.
  • After assigning the number, it's a good idea to verify the assignment in the Teams Admin Center and test the auto attendant to ensure calls route correctly.

Understanding Microsoft Teams Auto Attendant Setup

Microsoft Teams auto attendant phone number assignment

Setting up an auto attendant in Microsoft Teams is all about making sure your callers get to the right place without a hitch. Think of it as your digital receptionist, ready to guide folks through your organization's phone system. It's not just about answering calls; it's about making that first interaction smooth and efficient.

Prerequisites for Auto Attendant Configuration

Before you even start thinking about menus and greetings, there are a few things you need to have in order. First off, you'll need the right licenses. A Microsoft Teams Phone System license is a must-have. Without it, the auto attendant features just won't be available to you. It's like trying to bake a cake without flour – it just won't work.

  • Microsoft Teams Phone System License: This is non-negotiable for using auto attendants.
  • Admin Access: You'll need appropriate permissions within the Microsoft Teams admin center to make changes.
  • Resource Accounts: These are special accounts that auto attendants use to function. You'll need to create these before setting up the attendant itself.

Resource Accounts: The Foundation for Auto Attendants

Resource accounts are pretty important here. They're essentially the identity for your auto attendant. When you set up an auto attendant, you'll link it to a resource account. This account doesn't represent a person, but rather a service, like your auto attendant. You'll need to create these accounts first, and they'll need to be assigned a phone number later on. It's a bit like getting a phone number for a business line before you can actually use it.

Resource accounts act as the backbone for your auto attendants, providing them with the necessary identity and services to operate within Teams.

Licensing Requirements for Auto Attendants

Let's talk licenses again, because it's that important. To get an auto attendant up and running, you absolutely need a Microsoft Teams Phone System license. If you're planning on using direct routing or operator connect, you'll also need to consider the licensing for those services. It's not just about the Teams license; it's about the whole phone system setup. For more details on planning your setup, checking out the Plan for Teams Auto attendants article is a good idea.

Assigning A Phone Number To Your Auto Attendant

So, you've got your auto attendant all set up, or at least you're thinking about it. The next big step is giving it a phone number. Without one, how are people supposed to call in, right? It's not super complicated, but there are a few ways to go about it, and you'll want to make sure you do it right.

Navigating the Teams Admin Center for Number Assignment

This is probably where most people start. The Microsoft Teams admin center is your main hub for managing all things Teams, including phone numbers. You'll want to head over to the 'Voice' section, and then 'Phone numbers'. From there, you can see a list of all the numbers your organization has. If you've already got a number you want to use, you can click on it. You'll see an option to assign it. The key is to assign the number to a Resource Account. This is super important because your auto attendant actually uses that resource account to function. Think of the resource account as the identity of your auto attendant. If you're looking to get a new number, you'd typically request that through your telecom provider or directly within the admin center if you have the right setup, like Operator Connect. It's all about making sure the number is available and then linking it to the correct virtual identity.

Selecting and Assigning Available Phone Numbers

Once you're in the 'Phone numbers' section of the Teams admin center, you'll see a list. Some numbers might already be assigned to users, while others are sitting there, waiting for a purpose. You can filter these numbers to find what you need. When you find an unassigned number that looks good, you'll select it. Then, you'll click 'Edit' or 'Assign'. A pane will pop up asking who or what to assign it to. This is where you'll search for and select the specific Resource Account you created for your auto attendant. It's a pretty straightforward process, but double-checking that you've selected the correct resource account is a good idea. You can also assign an emergency location at this stage, which is pretty standard for any business phone number.

Verifying Phone Number Assignment to Resource Accounts

After you've made the assignment, you'll want to confirm it worked. Go back to the 'Phone numbers' list and find the number you just assigned. It should now show the Resource Account name next to it. You can also go to the 'Resource accounts' section in the admin center, find your auto attendant's resource account, and check its details. It should list the phone number assigned to it. If you're using PowerShell, you can run commands to check the properties of both the phone number and the resource account to make sure they're linked correctly. It's like a final check to make sure everything is connected and ready to go. This step is vital for ensuring your auto attendant is reachable by callers.

Methods for Assigning Phone Numbers

So, you've got your auto attendant set up, and now it's time to give it a voice – literally, a phone number. There are a few ways to go about this, and honestly, they're not too complicated once you know where to look. Think of it like getting a new phone number for your business; you've got options.

Using the Teams Admin Center Interface

This is probably the most straightforward method for most people. You'll be working directly within the Microsoft Teams admin center, which is where you manage a lot of your Teams settings. It's pretty visual, so if you're not a huge fan of command lines, this is your go-to.

Here's the general idea:

  1. Head over to the Teams Admin Center: Log in and find the 'Voice' section, then click on 'Phone numbers'.
  2. Pick your number: You'll see a list of available numbers. Find the one you want and select it. There's usually an 'Edit' option.
  3. Assign it: In the editing pane, you'll look for where it says 'Assigned to'. From there, you can search for your auto attendant's resource account and assign the number. You can also set up emergency locations here, which is pretty important.

Alternatively, you can go through the user list, find your resource account, and assign the number from its profile. It's all about finding the path that makes the most sense to you. The key is to make sure the number's country/region matches the usage location of your resource account.

Leveraging PowerShell for Automated Assignments

If you're dealing with a lot of numbers, or you just like the efficiency of scripting, PowerShell is your friend. It's way faster for bulk operations and can be a lifesaver if you're setting up multiple auto attendants or making changes across your organization. You can use commands like Set-CsPhoneNumberAssignment to get the job done.

For example, to assign a Calling Plan number, you'd use something like:

Set-CsPhoneNumberAssignment -Identity <ResourceAccountName> -PhoneNumber <YourPhoneNumber> -PhoneNumberType CallingPlan

Just swap out <ResourceAccountName> and <YourPhoneNumber> with your actual details. It's pretty powerful stuff, and once you get the hang of it, you can automate a ton of tasks. It's a good way to keep things consistent, especially if you're managing a large setup. You can even integrate this with other systems for a truly automated workflow, similar to how Zapier connects apps.

CoreView for Advanced Auto Attendant Configuration

While the Teams Admin Center and PowerShell cover the basics, sometimes you need more. That's where third-party tools like CoreView come in. These platforms often offer a more unified view of your Microsoft 365 environment and can simplify complex tasks, including auto attendant setup and number assignment. They're designed to give you more granular control and often come with features that help with reporting and management across your entire tenant. If you're looking for a more robust solution, especially for larger or more complex deployments, exploring these kinds of tools is definitely worth considering. They can help streamline processes that might otherwise be quite time-consuming.

Configuring Call Handling and Routing

Microsoft Teams auto attendant phone number assignment

Once your auto attendant has a phone number, the next big step is telling it how to actually handle calls. This is where you set up the voice prompts, decide what happens when someone presses a button, and figure out when your business is open. It's like giving your auto attendant a brain and a schedule.

Setting Up Greetings and Prompts

First impressions matter, right? Your auto attendant's greeting is the first thing callers hear. You can record your own audio file (make sure it's in WAV, MP3, or WMA format and under 5MB) or type out a message that the system will read aloud. This is where you'll tell people who they've reached and what options are available. You can also set up specific prompts for different scenarios, like "Please hold while we connect you" or "Your call is important to us."

  • Greeting Options:
    • Play an audio file (pre-recorded message)
    • Type a greeting message (text-to-speech)
    • No greeting (less common, but an option)

Defining Call Flow Logic and Destinations

This is the core of your auto attendant. You'll map out what happens after the greeting. Callers can be directed to different places based on their input. You can use the phone keypad (DTMF tones) or, if enabled, voice commands. Common destinations include:

  • Transfer to a person: Send the call directly to a specific user's Teams account.
  • Transfer to a call queue: Route the call to a group of agents handling specific types of calls.
  • Transfer to another auto attendant: Create a nested structure for more complex routing.
  • Disconnect: End the call (usually not ideal unless it's a specific scenario).
  • Directory Search: Allow callers to find people by name or extension.

You can map keys like '1', '2', or even '*' and '#' to these destinations. It's also a good idea to designate an "operator" option, often mapped to '0', so callers can reach a live person if the auto attendant can't help them.

Implementing Business Hours and Holiday Routing

Your auto attendant shouldn't answer calls the same way at 3 AM as it does at 3 PM. You can define specific business hours for each day of the week. Calls coming in outside these hours can be routed differently. This is perfect for playing a "We're closed" message or directing callers to voicemail. You can also set up special call flows for holidays. This means you can have unique greetings and routing for days like Christmas or Thanksgiving, without having to manually change settings every year. Just add the holiday dates and the specific call flow you want for that day.

Setting up business hours and holiday routing makes your auto attendant feel much more professional and considerate of your callers' time. It avoids the frustration of hearing a "we're open" message when it's clearly not.

Managing Phone Numbers for Teams Resources

Microsoft Teams phone number assignment interface on a smartphone.

Okay, so you've got your auto attendant set up, but how do people actually call it? That's where assigning a phone number comes in. It's not super complicated, but there are a few things to keep in mind. Think of it like getting a new phone number for your business – you need to make sure it's connected properly and points to the right place.

Understanding Phone Number Types and PSTN Connectivity

First off, not all phone numbers are created equal. You've got different ways these numbers can connect to the outside world, which is called Public Switched Telephone Network (PSTN) connectivity. The main types you'll run into are:

  • Calling Plans: These are numbers Microsoft provides directly. It's pretty straightforward – you get the number and the calling service from them.
  • Operator Connect: This is where you work with a certified telecom partner. They manage the number and the connection to Teams.
  • Direct Routing: This is for when you want to use your own existing phone lines or a third-party provider. You'll need to manage the connection yourself, usually with a session border controller (SBC).

Each type has its own setup process and requirements, so knowing which one you're using is pretty important before you start assigning numbers.

Assigning Numbers from the Phone Number List

One of the most common ways to get a number assigned is directly through the Teams admin center. You'll usually go to the 'Voice' section, then 'Phone numbers'. From there, you can see a list of available numbers. If you find one you like, you can select it and then assign it to your resource account. It's a pretty visual process, and you can usually see which numbers are already taken.

Here’s a general idea of the steps:

  1. Head over to the Teams admin center.
  2. Look for 'Voice' in the left-hand menu, then click on 'Phone numbers'.
  3. Find an unassigned number you want to use.
  4. Click on it, and then look for an 'Assign' or 'Edit' option.
  5. You'll then select your resource account from a dropdown or search field.
  6. Save your changes.

Editing and Unassigning Existing Phone Numbers

Sometimes you need to change things up. Maybe you got a new number, or you need to move a number from one auto attendant to another. You can do this through the same 'Phone numbers' section in the admin center. You'll find the number you want to change, click on it, and then select 'Edit'. From there, you can unassign the current resource account and assign a new one. If you need to completely remove a number, you'd typically unassign it first, and then it might become available to be deleted or managed differently depending on how you acquired it.

It's always a good idea to double-check that the country or region of the phone number matches the usage location of your resource account. This helps avoid any weird routing issues or compatibility problems down the line. Plus, it just makes sense logically – you wouldn't want a New York number for an auto attendant that's only supposed to serve customers in London, right?

Remember, assigning a number is just one piece of the puzzle. You still need to make sure your auto attendant is configured correctly to handle calls coming in on that number.

Advanced Auto Attendant Features

Microsoft Teams phone number assignment on a smartphone screen.

Integrating with Other Business Applications via Zapier

Think of your Auto Attendant not just as a phone system, but as a hub that can talk to all your other business tools. That's where Zapier comes in. It's like a universal translator for your apps. You can set things up so that when a call ends, or a specific option is chosen, an action happens automatically in another program. For example, if someone calls and asks for pricing, Zapier could automatically send them an email with your rate sheet. Or, if a call comes in after hours, it could create a ticket in your support system.

  • Automated Data Entry: When a caller selects an option, like "schedule a demo," Zapier can automatically create an event in your calendar or add a lead to your CRM. No more manual data input!
  • Real-time Notifications: Set up alerts for your sales team when a high-priority call comes in, or notify a specific department when a customer uses a certain menu option.
  • Workflow Triggers: Use call outcomes as triggers. For instance, if a call is transferred to a specific person, Zapier could start a follow-up task for that person in your project management tool.
This kind of integration means your phone system isn't just a passive answering service; it actively contributes to your business processes, saving time and reducing errors.

Utilizing AI-Powered Voicemail Transcription

We've all been there – staring at a voicemail, trying to decipher a mumbled message. AI-powered transcription changes that. Instead of listening to the audio, you get a text version of the message delivered right to you. This makes it super fast to scan messages, understand what's needed, and respond quickly. It's especially helpful if you get a lot of voicemails or if you're on the go.

  • Quick Review: Read voicemails like emails, making it easy to prioritize and act on messages.
  • Searchable Messages: Text transcriptions can be searched, so you can easily find past messages if you need to refer back to them.
  • Accessibility: Provides an alternative way to consume voicemail content for those who prefer reading or have hearing impairments.

Implementing Texting Workflows During Calls

This is a pretty neat trick. Imagine a caller is on the line, and your Auto Attendant recognizes they need specific information, like a product brochure or a link to your website. Instead of just telling them, the system can automatically send them a text message with that information right then and there. You can set up rules for this, like "if the caller asks about pricing, send them the price list link." It's a way to give callers information instantly without making them wait or jotting things down.

  • Instant Information Delivery: Send links, documents, or contact details via SMS during a live call.
  • Contextual Responses: The AI can understand the caller's intent and send the most relevant information.
  • Reduced Call Time: Quickly provide information that might otherwise require a longer conversation or a callback.

Best Practices for Auto Attendant Implementation

Setting up an auto attendant can feel like a lot, but getting it right from the start saves so much hassle down the line. Think of it like building a house – you want a solid foundation before you start hanging pictures.

Ensuring Proper Licensing and Permissions

First things first, make sure you've got the right licenses. For auto attendants in Teams, you'll generally need a Microsoft Teams Phone System license for the resource account. It's not just about having the license, though; it's about assigning it correctly. If you're using Calling Plans or Operator Connect, you'll also need to make sure those are set up and assigned to the resource account that the auto attendant uses. Without the right licenses, your auto attendant just won't work, no matter how perfectly you've configured everything else.

  • Verify Resource Account Licensing: Double-check that the resource account has a Teams Phone System license assigned.
  • Confirm Calling Plan/Operator Connect Assignment: If applicable, ensure the phone number and associated services are correctly assigned to the resource account.
  • Check User Permissions: Make sure the admin account you're using to set up the auto attendant has the necessary permissions within the Teams Admin Center.

Testing Your Auto Attendant Configuration

Don't just set it and forget it. Seriously, test everything. Call in yourself, have colleagues call in, and try out all the different menu options. What sounds good on paper might not work as smoothly in practice. Pay attention to:

  1. Call Flow Logic: Does the call go where you expect it to? Are there any dead ends or confusing loops?
  2. Greeting Clarity: Are the prompts easy to understand? Is the audio quality good?
  3. DTMF/Voice Input: Do the keypad presses or voice commands work as intended?
  4. Business Hours Routing: Test calls during and outside of your defined business hours to make sure the correct greetings and routing apply.
Testing isn't just about finding bugs; it's about refining the caller's experience. A smooth, intuitive auto attendant makes a great first impression, while a clunky one can frustrate potential customers before they even speak to someone.

Considering Emergency Location Assignments

This is a big one, especially if your auto attendant is handling calls that might involve emergencies. For any phone number assigned to a resource account, you need to make sure an emergency location is properly configured. This is critical for E911 services. If an emergency call is placed through your auto attendant, the system needs to know where that call is originating from to dispatch help effectively. Don't skip this step; it's a matter of safety and compliance.

Troubleshooting Common Assignment Issues

So, you've been trying to get that phone number assigned to your Auto Attendant, and it's just not cooperating. Don't sweat it, this happens more often than you'd think. Let's break down some of the usual suspects and how to get things back on track.

Addressing Licensing Conflicts

Sometimes, the issue isn't with the number itself, but with the licenses tied to the resource account. For an Auto Attendant to use a phone number, the associated resource account needs the right kind of license. If you're using a Teams Calling Plan number, for instance, the resource account needs a Teams Calling Plan license. It's easy to overlook this, especially if you're juggling multiple services.

  • Check the Resource Account License: Make sure the resource account linked to your Auto Attendant has a valid Microsoft Teams Phone Resource Account license. This is often the simplest fix.
  • Verify Calling Plan Licenses: If you're assigning a number from a Calling Plan, confirm that the resource account has the corresponding Calling Plan license assigned. You can usually see this in the Microsoft 365 admin center under the 'Calling Plan' column for users (and resource accounts function similarly here).
  • Review Other Service Licenses: Depending on your setup (like Direct Routing or Operator Connect), ensure any other required licenses or service plans are active and correctly assigned.
It's a good idea to keep a spreadsheet or a simple list of your resource accounts and their assigned licenses. This makes it way easier to spot discrepancies when things go sideways.

Resolving Number Assignment Latency

Ever assigned a number, but it feels like it's taking forever to actually work? That's often latency. When you make changes in Teams, especially involving phone numbers and resource accounts, it doesn't always update instantly across all the Microsoft servers. It can take a little while for the system to catch up.

  • Wait it Out: Seriously, sometimes the best solution is just patience. Give it 15-30 minutes, or even an hour, and try again. This is especially true after initial setup or major changes.
  • Clear Cache and Re-log: If you're working in the Teams Admin Center, try clearing your browser cache or logging out and back in. Sometimes your local view is just a bit behind.
  • Use PowerShell for Verification: While the Admin Center might show a delay, PowerShell commands like Get-CsPhoneNumberAssignment can sometimes provide a more up-to-date status. If PowerShell shows the number is assigned, but the Admin Center or the Auto Attendant isn't reflecting it, it's likely just a display lag.

Understanding Operator Connect Limitations

Operator Connect is a great service, but it does come with its own set of quirks when it comes to number management. Your Operator Connect provider handles a lot of the number provisioning, which means some of the controls you might expect aren't directly available in the Teams Admin Center.

  • Provider-Specific Processes: For certain actions, like assigning or changing emergency locations associated with a number, you might need to go through your Operator Connect provider directly. They have their own systems that interface with Teams.
  • Number Porting Delays: If you've recently ported numbers into Operator Connect, there can be a delay before they become fully available and assignable within Teams. Keep in touch with your provider about the status of the port.
  • Feature Availability: Not all features might be supported identically across all Operator Connect providers. For example, the ability to assign or change emergency locations might vary. Always check with your provider about what's supported.

If you're stuck, remember to check the prerequisites again. Did you get the number from the right place? Is the usage location correct? Sometimes, going back to basics solves the puzzle.

Having trouble with your assignments? Don't let common issues slow you down. We've put together some helpful tips to get you back on track quickly. For more detailed solutions and to see how we can help you succeed, visit our website today!

Wrapping Up Your Auto Attendant Setup

So, there you have it. Getting a phone number hooked up to your Microsoft Teams auto attendant might seem a little technical at first, but it's really about making sure your callers get where they need to go without any fuss. Whether you're using the admin center or diving into PowerShell, the goal is the same: smooth call routing. Once that number is assigned, your auto attendant is ready to do its job, making your business communications that much better. It’s a small step that can make a big difference in how people connect with you.

Frequently Asked Questions

What is a Microsoft Teams Auto Attendant?

Think of an auto attendant like an automated receptionist for your business phone. When someone calls, it answers and gives options, like 'Press 1 for Sales' or 'Press 2 for Support.' This helps direct callers to the right place without needing a person to answer every single call.

What do I need before setting up an auto attendant?

Before you start, you'll need a special type of account called a 'Resource Account.' This account acts as the brain for your auto attendant. You also need the right licenses, like a Microsoft Teams Phone Resource Account license, and you'll need to have phone numbers ready to assign.

How do I give my auto attendant a phone number?

You can do this in a couple of ways. The easiest is through the Teams Admin Center website. You go to 'Voice,' then 'Resource accounts,' pick the account for your auto attendant, and then assign an available phone number to it. You can also use a tool called PowerShell for this if you like doing things with commands.

Can I use a regular phone number with my auto attendant?

Yes, you can use regular phone numbers (also called PSTN numbers) to call your auto attendant. This means anyone, even if they don't use Teams, can call in and use the automated system you've set up.

What happens if I don't have a phone number for my auto attendant?

Without a phone number, people can't call your auto attendant from outside your organization. The phone number is how callers connect to the automated system you've created to guide them.

Can I change the phone number assigned to my auto attendant later?

Absolutely! You can change or unassign a phone number from your auto attendant's resource account whenever you need to. Just go back into the Teams Admin Center and make the changes in the resource account settings.

What's a Resource Account, and why do I need one?

A Resource Account is like a special ID card for services in Teams, such as auto attendants or call queues. It's needed so that these services can have their own phone numbers and settings, separate from a regular user's account. It helps keep things organized and working smoothly.

How long does it take for a new phone number to work with my auto attendant?

Sometimes, it can take a little while for changes to fully update, up to 24 hours. If you've assigned a number and it's not working right away, give it some time. If it's still not working after a day, you might need to check the settings or contact support.

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