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3CX Phone System for Windows System for Windows
Page 53
11. Connecting 3CX Phone Systems
Introduction
Note: This feature is not present in the free editions of 3CX Phone System
You can connect 2 separate
3CX Phone Systems using a 3CX to 3CX bridge, allowing
you to make calls between branch offices using your internet connection – and thus at no
charge. 
The “bridge” will be assigned a prefix, which users must dial to access the other 3CX
Phone System. This prefix must be followed by the extension number of the user they
wish to reach on the other 3CX Phone System. For example, if you assign the prefix “2”
to a bridge with another office, and within that office you want to dial someone who has
extension number 105 on that phone system, you would dial 2105 to reach that person
directly.
Creating a bridge
Screenshot 119 -  Adding a 3CX to 3CX bridge
To create a 3CX to 3CX bridge: