One number, the whole front desk.

How the group rings

Name the group and give it an extension if colleagues should dial it. All at once rings everyone and the first to answer takes the call. One after another rings each person in order, from the top. Take turns starts after whoever answered the last call, so calls are shared out. Add up to 50 people; anyone on a call, on Do not disturb or signed out is skipped. Set how long it rings, and where unanswered calls go: a voicemail, a queue, a menu or another group.

• Ask before connecting: each person hears who the call is for and presses 1, so a cell phone's own voicemail can't take it
• While it rings, callers hear your music on hold, another track, your own upload, or ringing

Extensions, handed out by themselves

Everyone on the phone system gets an extension, a short number like 102, when the phone system is on, and so does anyone who joins later. Admins set where numbering starts and whether extensions are 3 or 4 digits, and change anyone's. Extensions are 2 to 6 digits, can't start with 0 or 9, and can't clash with someone else's or a queue's. A person keeps their extension when they set their phone up again.

Set how someone's calls ring, and lock it

Admins and Phone admins can set Follow-Me for someone, like a receptionist whose calls should reach the desk phone first: the same choices they have in Preferences, their devices with a switch for each, and Lock these settings so they can see them but not change them. They get a notice, and the audit log records it. Default call handling sets what everyone gets until they choose their own.