Security and compliance in Microsoft Teams Voice

For regulated organisations, the telephony platform is not just an IT decision — it has to satisfy security, data protection and compliance stakeholders. One advantage of moving voice into Microsoft Teams is that calling inherits the governance framework the organisation has already assessed and approved for Microsoft 365, rather than introducing a separate system with its own controls.

Encryption and identity

Teams encrypts calls in transit, and access to the platform is governed by the same identity controls as the rest of Microsoft 365: conditional access policies, multi-factor authentication and device compliance requirements all apply to calling. Compare this with a legacy PBX, where handsets on desks are rarely subject to any identity policy at all.

Call recording and retention

Organisations with regulatory recording obligations can use compliance recording solutions that integrate with Teams through Microsoft's certified framework, capturing calls according to policy rather than relying on users to remember. Retention and deletion of recordings can then follow the same information governance rules as other business records.

Data residency

Where call data is stored follows your Microsoft 365 tenant's data residency arrangements. For UK organisations with residency requirements, this is a question to resolve at tenant level — and one your compliance team has likely already answered as part of adopting Microsoft 365.

Emergency calling

Emergency calling deserves specific design attention in any Teams Voice deployment. Because users are no longer tied to a desk, the deployment needs to handle location information for emergency calls appropriately — including dynamic location policies for office networks and clear guidance for remote workers. This is a standard part of a well-run migration, but it must not be an afterthought.

Questions to ask before you migrate

• Which calls, if any, are we obliged to record, and for how long must we retain them?
• Do our conditional access policies extend sensibly to calling scenarios?
• How will emergency calls present location information from each site?
• Who owns telephony configuration in the new model — telecoms, IT, or a managed service?

None of these questions is a blocker; all of them are easier to answer before migration than after. A well-scoped deployment treats security and compliance workstreams as part of the project plan from day one.