For organizations that need call recording for compliance purposes, admins can set via policy. To see how this works for calling and meetings, please see https://docs.microsoft.com/MicrosoftTeams/teams-recording-policy.
1:1 convenience recording is currently on the teams backlog. We will share an updated here as soon as it is available.
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We are waiting for 1:1 recording to be enabled before switching the rest of our firm to Teams calling. We have discovered a workaround though (as we have been testing the system) that is not a tenable long-term solution. You can start a 1:1 call, then add another participant to make it a 3 person call. The call recording is enabled as soon as it becomes a group call. Even after the third person drops off, the call recording function remains! So, I've been calling my cell phone (as a third party) and hanging up so that I can have the recording functionality for 1:1 calls.