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3CX Phone System for Windows System for Windows
Page 61
Screenshot 26- E164 Number processing settings
Firewall options
This section allows configuration of firewall specific options.
The Allow non-sequential RTP ports option needs to be switched on for some firewalls,
for example Microsoft ISA server.
In the option ‘Tunnel VOIP traffic via VPN over Port’, you can specify via which port the
3CX VOIP client must tunnel its SIP and RTP traffic. The 3CX VOIP client includes a mini
VPN that can tunnel all SIP and RTP traffic over a single port. This greatly reduces
firewall configuration and allows you to use port 80 for remote VOIP clients (providing you
are not already using port 80 for a web server).
Other
Music file on hold: Here you can specify a wav file with the music that you wish to play
for callers that are on hold.
Backup and Restore
3CX Phone System includes a convenient backup and restore function, that allows you to
create a complete backup of your phone system configuration to a file.
To restore phone system data, locate the backup of the phone system data and click
‘Restore’. Note that the current configuration will be OVERWRITTEN with the backup
data, and any changes that you have made since performing the backup will be lost.