When the system is installed behind a firewall/router that is using NAT, certain ports has to be opened to use the following services.
|Port number||For protocol||Is used for|
|123||UDP or if necessary TCP||NTP, if this is to be used to control the system time|
|5222/5223||TCP||XMPP, for instant messaging and the Gigaset T300 PRO / Gigaset T500 PRO Win Client. Port 5223 is used for secure connections with SSL|
|3090||TCP||JMS, for setting up and using an interconnection|