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You will not be able to assign extensions starting with 1XX, 1XXX & 9XX as these are reserved for Emergency services and Public Communication Numbers.
Below is a list of some of the services that the range is used for.
| Number | Service |
| 999 | Emergency Services |
| 101 | Police Non-Emergency Number |
| 105 | UK Power Networks |
| 111 | NHS |
| 112 | Alternative Emergency Number |
| 123 | Speaking Clock |
| 160 | Echo Test |
| 185 | Voicemail: to record voicemail prompt, or pick up voicemail for a group (e.g. sales) or for any individual extension |
| 186 | Voicemail: Used for specific extensions to pass calls directly to the mailbox. |
| 187 | Voicemail: Used for specific password-protected extensions to pass calls directly into the mailbox and log in. |
| 188 | Record voice prompts |
| 195 | Blind and disabled Directory Enquiry Facilities |
| 1471 | Call Return |
There are also restrictions on 116XXX & 118XXX numbers, as these are reserved for directory enquires & national helplines, such as;
| Numbers | Service |
| 116000 | Missing Children |
| 116111 | Childline |
| 116123 | Samaritans |
| 116006 | Helpline for Victims of Crime |
| 116117 | Non-Emergency Medical on-call service |
| 116123 | Emotional Support Helpline |
| 118NNN | Directory Enquiries |