Additional meeting and call-related features and issues within Microsoft Teams for business
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If a corporate user in France calls another corporate user in Germany by dialing their number in E164 format, not clicking on the audio call option, Microsoft will consider this as a domestic call, not a VoIP call. This is because both users are in the same zone (Zone-2) and have the same Calling Plan assigned. The call will be deducted from the user’s monthly minutes pool, and not charged as an international call or a Teams-to-Teams call. However, the user must have a valid phone number assigned to them in Microsoft 365, and the phone number must match the country/region where they are located. For example, a user in France must have a French phone number, and not a German or Romanian one.
If the user clicks on the audio call option, Microsoft will consider this as a Teams-to-Teams call, not a domestic call. This is because the call is made through the Teams app, not through the PSTN. The call will not be deducted from the user’s monthly minutes pool, and not charged as an international call or a domestic call. However, the user must have a valid phone number assigned to them in Microsoft 365, and the phone number must match the country/region where they are located. For example, a user in France must have a French phone number, and not a German or Romanian one.
Reference: https://learn.microsoft.com/microsoftteams/direct-routing-translate-numbers