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3CX Phone System for Windows System for Windows
Page 59
11. Connecting 3CX Phone Systems
Introduction
Note: This feature is not present in the free edition 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
To create a 3CX to 3CX bridge:
1. Click on the Lines > Add 3CX to 3CX bridge link to bring up the ‘Add 3CX to 3CX
bridge’ page.
2. Enter a name for the bridge and assign a virtual extension number. A bridge must be
assigned a virtual extension number so it can be addressed by the phone system. Accept
the default or choose another extension that is free.
3. Next you need to decide whether this 3CX Phone System will act as a Master or as a
slave. A slave registers with a master. If you have selected slave, you must also choose
whether you want to make a direct connection, or using the 3CX Tunnel, which allows all
SIP and RTP traffic to be sent via a single TCP port. The 3CX Tunnel vastly simplifies
firewall configuration.
4. If you selected ‘Master’ then all you need to do is enter the authentication details which
must be used by the slave to register with this 3CX Phone System.