Reserved Number Space

The following numbers should not be assigned within a domain because they are reserved for system functions. If you wish to use extension numbers in the reserved space, SkySwitch will charge $75 per domain for custom programming.

411Information
611Customer Service
911Emergency
933911 Test Number
700-799Used for Dynamic Call Parking Queues
7000-7999These are unusable as 4-digit extension numbers because they conflict with the 7+extension (3 digit extension) rule to transfer a call directly to voicemail.
70000-79999These are unusable as extension numbers because they conflict with the 7+extension (4 digit extensions) rule to transfer a call directly to voicemail.
99XXX+99 plus a users extension (3 and 4 digits) are reserved to work with Intercom features.
5000Unregistered Login to VMail (prompted for acct no and password)
5001Registered Login to VMail (prompted for password only)
5002Hot Desking Sign In
5003Requests the User's PIN then provides a 2nd dialtone (useful for calling from phones in public spaces
5004Reserved for Future Hot Desking Development.
8888This User has a limited view in the PBX portal. When assigned the Office manager role, the 8888 User can only view the Home and Call History pages. Other Office manager functions are hidden.
XXPlease use 3 and 4 digit extensions. 2 digit extensions will cause setup issues. NOTE: Extensions should not begin with the number 0.