Extension Numbering Guidelines

Extension Numbering Guidelines

Overview


Keeping your extension numbers organized is essential for long-term scalability, ease of management, and user clarity, especially as your organization grows. A well-structured numbering plan makes it easier to assign new users, integrate additional locations, and troubleshoot issues.

Extension numbers can range from 3 to 5 digits, giving you flexibility in how you build out your system. The goal is to implement a logical, predictable structure that supports both current operations and future expansion.

Below are some recommended guidelines to follow when designing 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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