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In order to have every Ozeki Phone System XE feature working correctly, you need to configure the firewall on the server machine appropriately. The following guide gives information about how to configure the firewall properly on the machine that runs Ozeki Phone System XE.
Ozeki Phone System XE offers a wide range of excellent services. These services use various ports. If these ports are blocked by a firewall, you may experience problems with using Ozeki Phone System XE - calls may not work, the system cannot access the database (SQL API) or your program cannot send requests to the system (HTTP API).
The main port used by Ozeki Phone System XE is the 5060 UDP port, by default. This port receives SIP messages from clients - if you close this port, no calls can be made. You can configure the ports used by the system in the System settings menu on the Web-based GUI of Ozeki Phone System XE.
Figure 1 enlists some tips on how to setup your firewall in order to make VoIP calls efficiently:
Figure 1 - Firewall setup
In order to ensure seamless operation, you need to open the ports on the firewall that are used by the Ozeki Phone System - or by external devices and softwares accessing it.
VoIP and firewall settings in Ozeki Phone System XE
First of all, you need to type in your username and password to login into your Ozeki Phone System XE (Figure 2).
Figure 2 - Login window
To modify Voip and firewall settings click on PBX features and then Preferences menupoint (Figure 3).
Figure 3 - Preferences
Under the General tab you can modify VoIP settings. If you want to change the default SIP service port (5060) you can do it here easily. Moreover, you can also add new RTP (Real-time Transport Protocol) port range and specify the protocol(s) for SIP communication (TCP or UDP) (Figure 4).
Figure 4 - VoIP Settings
At the Firewall section of the tab, you can make changes in the firewall settings of Ozeki Phone System XE (Figure 5).
Figure 5 - Firewall Settings
NOTE: firewall setting modifications are critical steps. Please make sure that you make the correct modifications - wrong firewall settings can create security holes exposing your system to hackers or malicious software. Please consult with a network administrator when making firewall settings. Open only those ports on the firewall that is used by the system - opening other ports is unnecessary - it is better to keep them closed.
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