| Audio Library | The store of greetings, holds music, recordings and voicemail audio. |
| Auto provisioning | Setting up a supported desk phone automatically from its MAC address. |
| Caller ID | The number shown to the person you call. |
| DID | Direct inward dialling number: an outside phone number that rings into the workspace. |
| Extension | A short internal number, such as 1010, used to call colleagues. |
| Feature code | A star code dialled from a phone, such as *98 for voicemail. |
| Find Me Follow Me | Ringing a user's devices one after another. |
| Group (ring group) | Several users who share calls to one extension or number. |
| Hot desking | Signing in at any shared desk phone so your calls follow you. |
| IVR | Interactive voice response: an automated menu that routes callers by key press. |
| MAC address | The unique hardware address of a desk phone, printed on its label. |
| Office hours | A schedule that routes calls differently when the office is open, closed, at lunch or on holiday. |
| PBX | Private branch exchange: the business phone system. |
| Realm | The server address a SIP device connects to. |
| Registered | A phone or app that is signed in to its extension and can receive calls. |
| SIP account | The identity (user name and password) a phone or app uses to connect as an extension. |
| Tenant | Your organisation's workspace in Hello2Hello. |
| Tenant Admin | A user with the admin role, who can use this portal. |