When setting up your Virtual Office extensions, you are generally able to use any numbers you like as extension numbers, except for those service ranges reserved for common system functions.

Review the Extension Usage Map below to see which numbers are and are not available for use as individual extension numbers in your 8x8 phone system. (This table is also visible in Account Manager on the Change Extension Number screen.)

To search for available extensions in Virtual Office Configuration Manager, click here.

1 - 8: Available
9 - 9: Reserved
10 - 89: Available
90 - 99: Reserved
100 - 199: Available
200 - 200: Reserved
201 - 399: Available
400 - 443: Reserved
444 - 444: Reserved for Auto Attendant
445 - 499: Reserved
500 - 500: Reserved for Voice Mail
501 - 555: Reserved
556 - 556: Reserved for Conference Bridge
557 - 699: Reserved
700 - 710: Available
711 - 711: Reserved
712 - 899: Available
900 - 999: Reserved
1000 - 1999: Available
2000 - 2000: Reserved for Ring Group
2001 - 4439: Available
4440 - 4599: Reserved for Additional Auto Attendant
4600 - 7999: Available
8000 - 8999: Reserved
9000 - 79999: Available

Need to add an extension?

If you wish to purchase a new extension for use in your phone system, we recommend contacting your 8x8 sales representative. You can also add new services in Account Manager.