Call Groups are user-assigned groups of Teams users that can receive calls on behalf of the group creator. The group can consist of up to 25 other Teams users. To share calls with others, a user creates a Call Group and adds the users they want to share their calls with. They can opt for the calls to either call them and the group at the same time or just divert all calls to the group and not ring themselves at all. A pilot number cannot be used for a Call Group. There are some limitations to Call Groups so please review these at the bottom of the article before creating your Call Group.
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Call Groups in Microsoft Teams enable Teams Voice users to manage who can receive calls on their behalf. To share calls with others, a user must create a Call Group and then add the users they want to share the calls with to that group. Users are notified when they are added to a Call Group.
As an end user you are responsible for setting up and managing your own Call Group through your Teams client. You can use Call Groups to either:
Note: by default if a user who is part of a Call Group is already on a call and a new call comes through from a Call Group or user they will not receive a new incoming call notification.
You can use a Call Group so that when you receive an incoming call in Microsoft Teams it also calls a group of people you have specified at the same time. This may be useful if you are a manager of a team and wish to share all your incoming calls with your team.
Note: All users added to a Call Group receive a notification in their Teams client.
You can use a Call Group so that when you receive an incoming call in Microsoft Teams it does not call you but calls a group of people you have specified instead. This may be useful if you are a manager of a team and you are going on holiday so would like your incoming calls to go to your team in your absence.
Note: All users added to a Call Group receive a notification in their Teams client.
KB0015495 - What is Microsoft Teams Voice?
KB0015736 - Teams Voice - FAQs
For more guidance on Call forwarding, Call Groups, and simultaneous ring from Microsoft please follow this link.