You can add additional numbers to your Teams account for your Auto Attendants and Call Queues. You will need to get or port these numbers over to the @voice portal. Once the numbers have been assigned to the respective account, you can then setup these numbers for your Auto Attendants or Call Queues.

Create a Resource Account

In Microsoft's setup, a phone number is not assigned to an auto attendant or a call queue, but rather to a resource account associated to the auto attendant or call queue.

To create a resource account with a phone number, the process is (assuming that you have already ported or purchased a number on the @voice portal that you want to use for this purpose):

  1. Obtain a Phone System Virtual User license. To get the Virtual User license, in the Microsoft 365 admin centre, go to Billing > Purchase services > Add-on subscriptions and scroll to the end - you will see "Phone System - Virtual User" license. Select Buy now. There is zero cost, but you still need to follow these steps to acquire the license.
  2. Go to Org-wide settings > Resource accounts. To create a new resource account, click Add. In the Add resource account pane, enter the Display name, Username (the domain name should populate automatically), and Resource account type for the resource account. The resource account type can either be Auto attendant or Call queue, depending on the app you intend to associate to the resource account. When you're ready, click Save.
  3. Next, apply a license to the recently created resource account in the Microsoft 365 Admin centre.

Assigning a Phone Number

Now that you have created a resource account with the required license (Virtual user license), you can now add a phone number to the resource account. To do this, you will need to login to your tenant using Powershell. Use the following cmdlet for Skype for Business Online Powershell (replacing the email address with the resource user you created in the previous step, and replacing the phone number with the number you ported/purchased from the @voice portal):

Set-CsOnlineApplicationInstance -Identity -OnpremPhoneNumber +61455555555

You can the proceed to create an Auto attendant or call queue. Remember to associate your auto attendant or call queue with the required resource account.

For more information on creating an auto attendant or call queue:-

Auto attendant -

Call queue -