European Union Data Boundary (EUDB)

Azure Communication Services complies with European Union Data Boundary (EUDB) announced by Microsoft Dec 15, 2022.

This boundary defines data residency and processing rules for resources based on the data location selected when creating a new communication resource. When a data location for a resource is one of the European countries/regions in scope of EUDB, then all processing and storage of personal data remain within the European Union. The EU Data Boundary consists of the countries/regions in the European Union (EU) and the European Free Trade Association (EFTA). The EU countries/regions are Austria, Belgium, Bulgaria, Croatia, Cyprus, Czechia, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, and Sweden; and the EFTA countries/regions are Liechtenstein, Iceland, Norway, and Switzerland.


Calls and meetings can be established in various ways by various users. We define a few terms:

  • Organizer: person who created the meeting, for example, set it up using Outlook
  • Initiator: the first person who joins the meeting (the meeting only exists as a calendar item before the first person joins it)
  • Guest: a participant who isn't a member of the tenant of the Organizer. May include a member of a different tenant, PSTN (dial-in) user, etc. (Note that this use of Guest is specific to this description and broader than used within IC3 generally, but useful for the discussion here)
  • Call: refers to a 1:1 call and\or to a Group call to a larger group. For the purposes of this conversation, they should be the same.

For EU communication resources, when the organizer, initiator, or guests join a call from the EU, processing and storage of personal data will be limited to the EU.


All threads created from an EU resource will process and storage personal data in the EU.

Other resources

For more information, please refer to the Microsoft documentation on the EUDB: