RingCentral Meetings - Mobile | Use Call Out
1. During a meeting, tap Participants.
2. Tap Invite > Invite Phone Contacts.
3. Enter the Invitee Name and Phone Number, and then tap Call.
NOTE: If a Participant invites another Participant in the meeting without the Host and attempts to dial a non-US number using Call Out, the Participant will get an on-screen message saying that "The number you dialed is not available until the host joins the meeting". If the Host has already joined and left the meeting, Participants will still be able to use the Call Out feature and invite another Participant.
RingCentral Meetings - Call Me and Call Out Overview