Microsoft can provide phone dial in and dial out conferencing PSTN (Public Switched Telephony Network, an old name for phone numbers) for Skype for Business Online and Microsoft Teams meetings.
The Microsoft service is included for users with Office 365 E5, or can be bought as a per user add-on in two ways:
- Pay for a per user per per month licence (standard subscription)
- Pay no per month licence, but pay per minute based on usage (Pay-per minute)
The service offers:
- toll dial in
- toll-free dial in
- dial out
- pay-per minute options
Once you have it, you conference invite will have phone numbers to dial into:
Commercial details are here: https://products.office.com/en-us/skype-for-business/audio-conferencing From this page you can download the per minute rates
I often get asked, which countries can I dial in from and dial out to. Unfortunately this can be a little tricky, Microsoft, not very helpfully, say the following:
This is mainly because they are adding numbers often and don’t want to keep updating the documentation.
So if you have Office 365 and PSTN Audio Conferencing you can check on the admin portal:
By default you have a standard “number set”. You can also add additional numbers if you need them. For example if the default UK number is a London number but you want to offer a number of local to your office/location in Glasgow, you can add a “service number”. This is also how you add Toll-Free numbers.
Interestingly Microsoft do currently keep an Excel file here with the locations in: http://tom.qa/CallingPlanExcel
Microsoft also allow third party certified ACP (Audio Conferencing Providers) to provide PSTN Conference numbers for Skype for Business Online, but not for Microsoft Teams. There is not a central list of ACP Providers, but they include, AT&T, BT, PGI (Modality Systems’ Parent Company). Intercall/West IP. They each offer different number sets, but you need to contact them directly for their lists.