Configure Toll-Free Numbers for Dial-In Conferencing in Office365

In this post we will discover how to configure Toll-Free Numbers for Dial-In Conferencing in Office365. Total time 5 minutes.

What is Dial-In Conferencing? (a.k.a. Cloud PSTN Conferencing or CPC)

Please see the following for more information: How To Enable Cloud PSTN Conferencing in Office365 in Skype for Business Online

What are the requirements for Toll-Free Numbers?

  1. You must meet the licensing requirements. See Skype for Business Online Licensing Overview for details.
  2. PSTN Consumption billing is required. See What is PSTN Consumption billing? for details. If PSTN Consumption billing is not purchased, you will receive an error message when attempting to acquire toll-free service numbers.
  3. For more information on Toll-Free numbers, see Getting Skype for Business service phone numbers
IMPORTANT: Existing toll-free service numbers can be ported from your existing telephony carrier. See Port a Phone Number to Cloud PBX in Office365 for more details on number porting. When porting, open a service request with Office365 Support to ensure the toll-free number being ported is configured to support higher concurrent calling capacity.

How Do I Configure? (Click on the images to zoom in if needed)

  1. Login to the Office 365 Admin Portal as an administrator by browsing to
  2. On the left side, hover the mouse cursor over the iconicon and select Skype for Business.

3. Within the Skype for Business Admin Center, on the left side click Voice.



4. Within the Voice section, the Phone Numbers tab will be displayed. Click the + sign.

phone numbers tab


5. You will be presented with two options 1) New User Numbers 2) New Service Numbers. Click New Service Numbers.

select new service numbers


6. On the Add New Service Numbers section, from the State/Region drop down menu select Toll-Free. In the Quantity field, type the amount of numbers you wish to acquire. When finished, click Add.


Select Toll Free Service Number


7. In the Toll-Free, United States section, click Show Numbers to see the toll-free number that will be acquired. When finished click Acquire Numbers.





8. You will be returned to the phone numbers tab. Locate the new toll-free number that was just acquired in the list, and check the box next to it to display it’s details:



returned to phone numbers tab toll free shown



9. Click Assign. Review the configuration on the fly out then click Save.




10. You will be returned to the Phone Numbers tab. Confirm the number has been assigned on the right side.


number assigned successfully

Congratulations! You have successfully configured Toll-Free numbers in Office365! The next section will demonstrate how to test.

11. Create a new user account and assign the Office365 E5 license to the user. Allow time to pass for the user account to be enabled for Skype for Business.

12. Return to the Skype for Business Admin Portal. On the left side click Dial-In Conferencing.

click dial in conf


13. Click the Dial-In Users tab. Click the user account you just created. Confirm the Default toll free number for the user is the number that was previously acquired.


dial in user

14. Create an Outlook profile for the user account you just created and launch Outlook to connect to that user’s mailbox. Launch Skype for Business and sign-in as that user account.

15. From within Outlook, create a new Skype Meeting.

16. In the body of the Skype Meeting, confirm the toll-free number is displayed.



How To Enable Cloud PSTN Conferencing in Office365 in Skype for Business Online

In this post, we will discuss how to enable Cloud PSTN Conferencing in Office365, assign to a user account and test. Total time required is 5-10 minutes.

What is Cloud PSTN Conferencing?

Cloud PSTN Conferencing is a feature in Office365 E5 offering the capability to join a Skype for Business meeting using a traditional dial-in telephone number as an alternative to using the Skype for Business client on a PC or smartphone. This will allow the meeting attendee to participate in the audio only portion of the meeting.

This can also be used independently of Skype for Business as a traditional conference bridge, a useful scenario when the full client experience is not desired or inaccessible.

What’s Required?

To enable, you must have:

  • An Office365 tenant
  • A E5 subscription (either trial or purchased)
  •  At least one user account located in the tenant
    • Assign the user the full Office365 Enterprise E5 license, or the Skype for Business PSTN Conferencing license.

How Do I Enable It?

1) Login to your Office 365 tenant as an administrator

2) From the left side of the Office365 Admin Center, expand Admin and click Skype for Business.

3) From the left side of the Skype for Business Admin Center click Dial-In Conferencing.


4) Click the Microsoft Bridge tab

5) The phone numbers in this list are all available conference bridge telephone numbers available to you.

6) Click the Dial-In Users tab.

7) Check the box next to a user you wish to assign a dial-in conferencing number to and click the pencil icon.

8) This will display the user’s dial-in conferencing properties. From the Provider Name menu select Microsoft

9) Microsoft will be assigned as the dial in conferencing service provider for this user. From the Default Number menu select a default dial-in conference telephone number for this user. This number will be used on all meeting invitations sent by this user. Note the check box to allow unauthenticated callers to be the first people in a meeting. When finished click Save

10) Please allow a few moments for the changes to be saved. When complete, the following dialog box will display confirming the dial-in conferencing provider has been changed to Microsoft and the Conference ID and PIN that have been assigned to the user. Click Close

11) Next, let’s run a test to see the new dial-in conferencing number. Launch Outlook as the user. A new email message has been sent by Office365 informing the user they have been enabled for Skype for Business Dial-In Conferencing and contains the telephone number to access conferences, their personal conference ID and their organizer/leader PIN.

12) Login to the Skype for Business desktop client on the PC as the same user that was enabled for Dial-In Conferencing. Within Outlook, click New Items then click Skype Meeting. This will create a new Meeting Request that is Skype enabled.


13) In the body of the Meeting Request contains the dial-in telephone number that was assigned to the user, along with the conference ID. This conference ID will be entered when dialing into the meeting using this telephone number.

Important: The conference ID will stay the same for each new meeting that is created.

14) Open the Skype for Business desktop client, and from the options menu (gear icon) select Meet Now:

15) Click the ellipsis icon (three dots) and select Meeting Entry Info

16) The dial-in telephone number will be displayed along with the Conference ID. This can be useful if needing to rely the information to a meeting you are currently joined to. (Alternatively clicking the Invite More People button will allow you to type a phone number, Skype for Business will automatically call that number and add the participant to the meeting – no need to enter a conference ID!)

That’s it! Now, let’s explore the administration of Cloud PSTN Conferencing in Office365:

1) Return to the Skype for Business Admin Center in the Office365 Admin Portal

2) Click on Dial In Conferencing on the left

3) Click the Microsoft Bridge Settings tab

4) From here, the following can be configured:

  • Entry and Exit notifications can be enabled/disabled.
  • Asking callers to record their name prior to joining the meeting.
  • Configuring the PIN length.
  • Send users to email when changes to their dial-in conferencing settings are modified.


 There are also personal meeting options the user can configure, from within a new Skype Meeting within Outlook:


1) Click Meeting Options from the ribbon.

2) From the Permissions tab on the left, note the various items that can be configured by the user such as Lobby settings, who get’s marked as a presenter and any features of the meeting to limit. These settings are only applied to this specific meeting, however, clicking Remember Settings will save these settings for each new future meeting.

Finally, it’s important to note that if a new user is created in Office365 and assigned a Skype for Business PSTN Conferencing License, the user will automatically be enabled for dial-in conferencing, no configuration is required.

Cloud PSTN Conferencing is that easy! Who would have though conference bridges would be this easy in the cloud?