We use special telephone number ranges at the events.
| Range | Use / Reserved for |
|---|---|
| 1000 - 1999 | Orga / Event / Venue |
| 2000 - 2099 | Eventphone / PoC |
| 2100 - 9899 | public range |
| 9900 - 9999 | Internal, special services, services that offer added value for several users. |
Just because a number is not listed in the phone book does not mean that it is not used.
If, during the creation of a number in GURU, a message appears telling you that the extension is already in use, then this is correct. There is no reason to open a support ticket.