| Reserved Extensions |
| 0-99 |
Reserved for internal use |
| 411 |
Local Directory Assistance |
| 611 |
Echo Networks 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 |
| 5001 |
Registered login to voicemail |
| 9900 |
Unregistered login to voicemail |
| 9901 |
Registered login to voicemail |
| 9902 |
Hot Desking Sign In |
| 7000-7999 |
Reserved for 7+extension transfer to voicemail feature |
| 9900-9999 |
Reserved for system features |
