PSTN Calling provides domestic and international calling plans with Skype for Business. Organizations can subscribe to calling
plans from Office 365 and use existing phone numbers or get new numbers.
For additional information, see
What is PSTN calling?
Yes, customers with Enterprise E1 and E3 can upgrade to PSTN Conferencing and Cloud PBX + PSTN Calling as standalone offers.
While Cloud PBX provides the call control capabilities for end users and the administrative features for IT, it connects
to the PSTN through either Microsoft PSTN Calling add-on or to your existing PSTN circuits
using Cloud Connectivity.
Yes, in order to use these services, you must have Skype for Business Plan 2, or equivalent E SKU (E1/E3/E4/E5), deployed as a standalone or as a component of Office 365 Enterprise E1, E3, or E5 suites. To use PSTN Calling, you must also purchase Cloud PBX or Office 365 Enterprise E5 (which includes Cloud PBX functionality) as a prerequisite.
If you are an Office 365 Enterprise E5 or Cloud PBX customer, you can connect your existing PSTN service provider with Microsoft cloud-based call
control. Scenarios are based on whether a customer already has a Skype for Business Server
deployed. You can set up a new server pool or use an existing Skype for Business Server
deployment to configure it to connect to Cloud PBX functionality that is covered under
existing server licensing.
If you don’t have an existing server, you can use a minimal Skype for Business Server deployment through the Cloud Connected
Edition that includes four preconfigured Virtual Machines (VMs) deployed on customer-owned
Windows Servers. Skype for Business Server roles in VMs are not paid roles and are licensed
for use with Cloud PBX.
PSTN Calling is subject to geographical and channel availability. Initial availability of PSTN Calling for the United States
was on December 1, 2015. See
for more information.
- For domestic PSTN Calling plans, each licensed user is allocated the above-stated
domestic dial-out minutes pooled at the tenant level.
- For international PSTN Calling plans, each licensed user is allocated the above-stated
domestic dial-out minutes and 600 international dial-out outbound minutes pooled
at the tenant level.
For all local and international calls placed to users within the same tenant, peer-to-peer calling is enabled and the call
is placed over the Voice Over IP network, meaning that all local and international calls
placed within the tenant will not count towards the allocated minutes.
If you are set up for PSTN Consumption billing, when you exceed the PSTN Calling allocated minutes (the total of all minutes
associated with users’ assigned licenses pooled at the tenant-level), you will be charged
for usage that goes above and beyond the tenant-pooled limits. If you are not set up
for Consumption billing, you will lose your service until the minute limits are reset
the following month.
No, domestic and international minute allocations are based on a monthly cycle. Any minutes that are unused during one month
will not rollover to the next month.
Calls placed to other users whose license resides in the same Office 365 tenant, domestic or international, will not count
towards the excessive use limits for PSTN Calling. When calls are placed within the same
tenant, reverse number lookup functionality will validate that the call originated in
the same tenant, and it will be placed as a peer-to-peer call on the Voice Over IP network,
Domestic calling, per the
Skype for Business Online PSTN service use terms, is defined as: “The ability for the user to make calls to numbers located
within the country of Office 365 assignment for that user.” In other words, if a US-based
user (meaning their Office 365 license is assigned in the US) travels to London, any
calls they make back to the US are considered domestic calls.
Consumption billing for PSTN services will launch on June 1, 2016, enabling PSTN Conferencing toll-free dial-in, international
dialing for users with PSTN domestic calling, and additional domestic and international
Set-up and management:
- Customer selects an individual pre-paid balance amount (e.g. $100), minimum balance
threshold (e.g. $10), and balance replenishment amounts (e.g. $90).
- Customer funds their pre-paid balance directly in the Office 365 Portal (as opposed
to buying on CPS – SKU on PL).
- It’s important to establish appropriate replenishment amounts as all payments made
to fund prepaid balance are valid for one year.
- If customer elects to not set up a pre-paid balance and they reach their monthly
excessive usage limit, their PSTN services is suspended for the remainder of
- Account balance is drawn down as services are consumed.
- Customer can select their EA Enrollment as a payment instrument in the Office 365
- Each time a customer’s balance reaches the minimum threshold, a replenishment of
funds is triggered at which time the customer is invoiced.
Billing and reporting:
- Consumption billing charges appear as a line item on the EA Invoice as Skype for
Business PSTN Consumption.
- Usage reports are available in the Admin Center at any time.
- Customers without an EA can set up an account with a credit card or invoicing payment
Yes. Usage reporting will be available via the Skype for Business Admin Center.
In addition, you can restrict usage to certain users if they are at risk of exceeding their monthly tenant-pooled limits.
Yes, you can assign users phone numbers directly through the Skype for Business Admin Center. For more information, see
Getting phone numbers for your users. If your users already have phone numbers assigned by another provider,
you can transfer those existing phone numbers from your service provider or phone carrier.
You can also add up to 10 percent more numbers in addition to what you have licenses for. For example, if you purchase 100
licenses, you can acquire up to 110 new telephone numbers.
Note: the above applies only to acquiring NEW phone numbers
through Office 365 and Skype for Business; there is no limit on porting in telephone
numbers to our service; if you own the telephone number, you can port in any quantity
of telephone numbers regardless of the number of licenses you have.
If you have PSTN Consumption billing enabled, you can pay per minute for international calls. Otherwise, the international
call will not connect.