Extension Numbering Guidelines
Keeping your extension numbers organized is the key to scalability. Extension numbers can be between 3 and 5 numbers. Here are some numbering guidelines to follow when building a new phone system.
Extensions (Users)
Pattern: 1 series
Example: 101
IVR Menus (Virtual Receptionists)
Pattern: 1 series
Example: 1001
Directories
Pattern: 2 series
Example: 2001
Conference Bridges
Pattern: 3 series
Example: 3001
Queues
Pattern: 4 series
Example: 4001
Toggle-Based Routes
Pattern: 5 series
Example: 5001
Ring Groups
Pattern: 6 series
Example: 6001
Call Parking
Pattern: 7 series
Example: 700
Paging/Intercom Groups
Pattern: 8 series
Example: 8001
Announcements
Pattern: 9 series
Example: 9001
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