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3CX Phone System for Windows System for Windows
Page 61
12. 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 or a 3CX Phone System with another
SIP phone system using a 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 or SIP 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 bridge:
1. Click on the Add > Bridge menu option to bring up the ‘Add 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. Now select the Type of bridge:
Master (Direct (UDP) - If you select ‘Master’, the other PBX must register with this
system. In Direct (UDP) mode, all traffic will be sent via UDP and will use multiple
ports
Master (Tunnel (TCP) ) - If you select ‘Master’, then the other PBX must register
with this system. The tunnel option allows all SIP and RTP traffic to be sent via a
single TCP port. The 3CX Tunnel vastly simplifies firewall configuration, although
it can not provide the same quality as a direct connection. Also, the tunnel option
can only be used against another 3CX Phone System.
Slave (Direct (UDP) – This system will register with the remote system using direct
SIP.
Slave (Tunnel (TCP) ) – This system will register with the remote system using the
3CX tunnel.