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Reserved Number Space

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The following numbers should not be assigned within the phone system because they are reserved for system functions.

Restricted Numbering
00-99Reserved for internal use
611Customer Service
911Emergency
700-799Used for Dynamic Call Parking Queues
5000/9900Unregistered Login to VMail (prompted for acct no and password)
5001/9901Registered Login to VMail (prompted for password only)
5002/9902Hot Desking Sign In
7000-7999These are unusable as extension numbers because they conflict with the 7+extension rule to transfer a call directly to voicemail
9900-9999System Features
Best Practice Dial Plan
100-599User Extensions
800-899User Extensions
1000-4999User Extensions
5003-6999User Extensions
8000-8999User Extensions
9000-9899Special Extensions (Example : Cloud Extension that forward to a cell phone, Fax Users, call routing, call queues and auto attendants)
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Reserved Number Space

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