Extension Numbering & Reserved Number Space
Scope:
This article outlines the reserved and permitted numbering schemes to use for extensions and features.
| Restricted Numbering |
|---|
| 0-99 | Reserved for internal use |
| 411 | Local Directory Assistance |
| 611 | Customer Service |
| 811 | Call Before You Dig
|
| 911 | Emergency |
| 933 | Emergency Testing |
| 988 | National Suicide Hotline |
| 600-699 | Reserved for 611 feature
|
| 700-799 | Reserved for Call Parking Queues |
| 900-999 | Reserved for 911, 933, and 988 features |
| 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 | Reserved for 7+ext transfer to voicemail feature |
| 9900-9999 | Reserved for system features |
| Best Practice Dial Plan |
|---|
| 100-599 | User Extensions |
| 700-719 | Call Parks - No Ringback |
| 720-799 | Call Parks with Ringback |
| 800-899 | User Extensions |
| 1000-4999 | User Extensions |
| 5003-6999 | User Extensions |
| 8000-8999 | User Extensions |
| 9000-9899 | Auto Attendants |
| 9100-9199 | Call Queues (Excluding Call Parks) |
| 9200-9899 | Special Extensions (ie Forwarding Users, Call Routing Users, Analog/Paging Systems) |
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