Having a consistent numbering scheme for the extensions created within a customer domain allows for easier turn-up and easier reference points when troubleshooting
Please use 3, 4 and 5 digit extensions. 2 digit extensions will cause setup issues.
NOTE: Extensions should not begin with the number 0.
Suggested Three Digit Extension Range
|
Number Range |
Feature/Function |
|
100-199 |
Extensions |
|
200-299 |
Extensions |
|
300-399 |
Extensions |
|
400-499 |
Call Queues |
|
500-599 |
Call Queues |
|
600-699 |
Conferences |
|
700-799 |
Call Parks |
|
800-899 |
Auto Attendants |
|
900-990 |
Auto Attendants |
Suggested Four Digit Extension Range
|
Number Range |
Feature/Function |
|
1000-1999 |
Extensions |
|
2000-2999 |
Extensions |
|
3000-3999 |
Extensions |
|
4000-4999 |
Call Queues |
|
5002-5999 |
Call Queues |
|
6000-6999 |
Conferences |
|
700-799 |
Call Parks |
|
8000-8999 |
Auto Attendants |
|
9000-9990 |
Auto Attendants |
Suggested Five Digit Extension Range
|
Number Range |
Feature/Function |
|
10000-19999 |
Extensions |
|
20000-29999 |
Extensions |
|
30000-39999 |
Extensions |
|
40000-49999 |
Call Queues |
|
50002-59999 |
Call Queues |
|
60000-69999 |
Conferences |
|
700-799 |
Call Parks |
|
80000-89999 |
Auto Attendants |
|
90000-99990 |
Auto Attendants |
Reserved Ranges
There are reserved numbering ranges used for specific system features. Please see the table below for details.
|
Restricted Numbering |
|
|
0-99 |
Reserved for internal use |
| 311 | Non-emergency municipal government services. Only supported in certain major cities. |
|
411 |
Local Directory Assistance |
|
811 |
Call Before You Dig |
|
911 |
Emergency |
|
933 |
Emergency Testing |
|
988 |
National Suicide Hotline |
|
7xx,7xxxx,7xxxxx |
Reserved for Call Parking Queues |
|
911,933,968 |
Reserved for 911, 933, 988 features |
|
995-998 |
Technical Support |
|
9995-9998 |
Technical Support |
|
99995-99998 |
Technical Support |
|
999,9999,99999 |
Reserved for Engineering |
|
5000 |
Unregistered Login to Voicemail - Prompts for extension and password |
|
5001 |
Registered Login to Voicemail - Prompts for password only |