Extension Numbering & Reserved Numbers
Scope
Outline of the available numbers for extensions and reserved numbers.
Requirements
- None
Links
- None
Restricted Extensions
| Extension Range | Designated Purpose |
| 0 - 99 | Reserved for internal use |
| 211 | FCC standard for community support information (free and confidential services) in some regions of the United States |
| 311 | FCC standard for municipal government services (non-emergency line) in some regions of the United States |
| 411 | Local Directory Assistance |
| 511 | FCC standard to access traveler information services in some regions of Canada and the United States |
| 611 | Customer Service |
| 711 | FCC requirement to connect a deaf caller to a Telephone Relay Service |
| 811 | Call Before You Dig |
| 911 | Emergency Services |
| 933 | Emergency Testing |
| 988 | National Suicide Hotline |
| 700 - 719 | Call Parking without Ringback |
| 720 - 799 | Call Parking with Ringback |
| 900 - 999 | Reserved for Emergency, Municipal, Community and Other Services |
| 5000 | Unregistered Login to Voicemail - Prompts for extension and password |
| 5001 | Registered Login to Voicemail - Prompts for password only |
| 9900 | Unregistered Login to Voicemail - Prompts for extension and password |
| 9901 | Registered Login to Voicemail - Prompts for password only |
| 9902 | Hot Desking Sign In |
| 7000 - 7999 | Transfer to Voicemail |
| 9900 - 9999 | Reserved for System Features |
| 70000 - 79999 | Transfer to Voicemail |
Available User Extensions
3-Digit Extensions
- 100 - 599
- 800 - 899
4-Digit Extensions
- 1000 - 4999
- 5003 - 6999
- 8000 - 8999
System Extensions
| Extension Range | Usage |
| 700 - 719 | Call Parks - No Ringback |
| 720 - 799 | Call Parks - Ringback |
| 9000 - 9099 | Auto Attendants |
| 9100 - 9199 | Call Queues (Excluding Call Parks) |
| 9200 - 9299 | Routing Extensions |
| 9300 - 9399 | Virtual Users |
| 9400 - 9499 | Non-User Voicemails |
| 9500 - 9599 | Fax Users |
| 9600 - 9699 | External Forwarding Extensions |
| 9700 - 9799 | Special Extensions |
| 9800 - 9999 | System Reserved |
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