Registering to GatekeepersThis section describes what gatekeepers are and how you can register to them.What is a gatekeeper?A H.323 gatekeeper controls all H.323 clients (e.g.  or NetMeeting) in its zone. Although gatekeepers have a large range of different features, one of their most important functions is to perform address translation between symbolic alias addresses and IP addresses. This means that you can use aliases instead of IP addresses to call another user. For instance, if you want to call the user "Damien" but you do not know his current IP address (dynamic IP addresses) you can easily use his alias at the gatekeeper. The gatekeeper will now direct your call to the correct IP address.There are many reasons for users to register to a gatekeeper. An alias at a gatekeeper requires a registration, for example. Some gatekeepers do not allow unregistered users access to any of their features, in such a case you may not be able to call any user with an alias via the gatekeeper.Registering to gatekeepers allows you to register to one gatekeeper. All settings can be configured with the preferences window. Please select Edit-> Preferences and choose Gatekeeper Settings (located in the H.323 Settings subcategory) on the left. The display window contains all information necessary for a correct registration to a gatekeeper. provides three different methods to register to a gatekeeper. Available values for the Registration method are as follows:Gatekeeper host - This method should be chosen when you know the hostname or IP address of the gatekeeper.  will directly connect to the gatekeeper.Gatekeeper ID - This method should be used when you have a valid ID at a gatekeeper but you do not its hostname or IP address. In this case  broadcasts a message and registers to the gatekeeper which answers to your ID.Automatically discover - If you are not sure which method to choose you can select this method. But please be aware that this method does not always work and is not recommended.After having chosen the Registration method there are still four further fields - Gatekeeper ID, Gatekeeper host, Gatekeeper alias and Gatekeeper password. The four fields should contain the following information:Gatekeeper ID - The Gatekeeper identifier to register with. This field is required when you have chosen Gatekeeper ID as the Registration method.Gatekeeper host - Hostname or IP address of the gatekeeper. This field is required when you have chosen Gatekeeper host as the Registration method.Gatekeeper alias - Gatekeeper alias to use when registering.Gatekeeper password - Password to use for H.235 authentication when registering to the gatekeeper.Gnomemeeting will automatically register/unregister to the gatekeeper when it is started/closed.
