Historically Islands mode supported Microsoft Teams Direct Routing. Microsoft no longer supports Teams Direct Routing in Islands mode. It is not possible to migrate an account to Teams only mode with the service activated since the domains will not reactivate for voice.
https://docs.microsoft.com/en-us/microsoftteams/migration-interop-guidance-for-teams-with-skype
Phone System Direct Routing is not supported in Islands mode.
Customers who are using the service with Islands mode, and wish to move to Teams Only mode need to follow the following process:
| Note: this process is service affecting an will result in the inability to make and receive calls through the connector whilst the move is taking place, Due to the occasional unpredictability of Microsoft's activation, this process may take some time so is best performed during an off-peak time where a change-window of several hours is available. |
- In the Services Tab, disable the Teams service by clicking the 'Disable Sync' buttonIcon
- In the customer Microsoft 365 portal https://admin.microsoft.com/ delete the domains belonging to the service (there will be at least two).
- Complete the move to Teams Islands Mode:
https://docs.microsoft.com/en-us/microsoftteams/setting-your-coexistence-and-upgrade-settings#set-upgrade-options-for-all-users-in-your-organization - When the organisation has migrated to Teams Only Mode, then use the 'Enable Sync' function in the Teams tab in the portal.
The domains will be re-added to the tenant and provisioned for calling.
The transition is then complete