Audio Conferencing

Boost team collaboration with dial-in conferencing options from virtually any device. With Audio Conferencing, you can consolidate your meeting solutions and reduce complexity while enabling employees to attend meetings by phone wherever they are.

Audio Conferencing is available as a part of the Office 365 Enterprise E5 subscription or available on a pay-per-minute basis as an add-on to Office 365 E1 or E3 subscription.

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Join meetings by phone

Enjoy convenient dial-in access to online meetings, allowing participants to join scheduled meetings from any telephone.

Rich calling features

Meeting participants can join online meetings using local dial-in numbers from regions around the world, or have the service call them back on their landline or mobile phone.

Office 365 management

Conveniently manage your Audio Conferencing needs from within the Office 365 admin center. Audio Conferencing works seamlessly with Office 365 and provides you with a single point of administration.

Audio Conferencing includes:

Tolled dial-in

Join the audio portion of a meeting from virtually anywhere by dialing a PSTN phone number and entering a conference passcode. Simplify your meetings by generating a general dial-in phone number for all attendees to use.


Dial out to other meeting attendees or transfer an in-progress meeting to another number from within the meeting. After joining a meeting, you can dial out to another PSTN endpoint or mobile phone. Dial-out calls can be domestic or international.

Toll-free dial in

Join a meeting by dialing a toll-free number and entering a PIN. Toll-free PSTN numbers can either be domestic or international.

Pay-per-minute options

Option to add Audio Conferencing to an Office 365 Enterprise E1 or Office 365 Enterprise E3 subscription and pay for toll dial-out, toll dial-in, and toll-free dial-in on a per minute basis.


Requirements for Audio Conferencing

If you have Office 365 Enterprise E5, Audio Conferencing is included.

Learn more about Office 365 Enterprise E5

If you have Office 365 Enterprise E1 or E3, Audio Conferencing is available for a {PSTNBizE3ConferencingAddOn|price}/month add-on fee. Tooltip about taxes and service usage limits

Learn more about Office 365 Enterprise E1

Learn more about Office 365 Enterprise E3

Plus applicable tax


See rates for where you want to call

Get a detailed list of the toll and toll-free rates for your agreement by country and currency. Communications Credits rates are for charges that are not included in your subscription plan. Tooltip with details about taxes, international rates, and rate changes

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Frequently Asked Questions
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Tolled dial-in conferencing and domestic dial-out conferencing services are both included in the Audio Conferencing service plan. Each user is assigned an Audio Conferencing number based on where that user has been assigned a licensing location as an Office 365 user. A participant can dial out to other participants as a domestic call based on the country of that dial-out location. The user will have a link to around 60 dial-in numbers from countries across the globe, which can be used by participants in those countries to join the call without international charges.

Although there are no distinct service limits associated with tolled dial-in and domestic dial-out conferencing, Microsoft monitors the service for fraud or abuse and reserves the right to limit use in cases where the service quality might be compromised.

Between now and December 31, 2018, there is an introductory offer period during which international dial-out capabilities are available to customers in all Audio Conferencing sell-to countries. These customers can use international dial-out conferencing to any tolled number residing in any one of the Audio Conferencing sell-to countries.

Enabling Communication Credits allows users to dial in to conferences toll free, and conference organizers can dial out internationally after December 31, 2018. Check rates for toll free dial-in and for international dial-out.