Installation guide
Table 5-20 Configuring the gatekeeper
Field Name Description
Use gatekeeper Enables/disables the use of a gatekeeper. If No is selected, all
the other fields are greyed. If Yes is selected, the XT Codec
Unit can use the gatekeeper’s services.
Automatic IP address Automatic gatekeeper discovery. The XT Codec Unit searches
for an available gatekeeper.
IP address Enter the IP address of the gatekeeper, if you do not use
Automatic IP address.
Use H.460 If set to Yes, the system uses H.460 firewall traversal
features.
Auto registration Automatic registration is used to discover whether the
registration state to the gatekeeper has been lost. Loosing
registration state could be very annoying as a gatekeeper call
will not reach the XT Codec Unit and the latter wouldn’t be
aware that it is unreachable. This option must be enabled only
if the gatekeeper sends the RAS Information Request messages
(IRQ) at periodic interval (e.g.: every 60 seconds). The XT
Codec Unit replies with the RAS Information Request Response
messages (IRR), as mandated by H.225.0.
Registration expiration
time
If the XT Codec Unit does not receive an IRQ for a time longer
than the Registration expiration time, it presumes that the
registration state in the gatekeeper has been lost (due to line
problem or gatekeeper crash), and repeats the registration
procedure.
Re-registration interval
time
Therefore the XT Codec Unit starts a new registration
procedure, repeating it upon failure at the Re-Registration
Interval Time. This value is used also for normal registration
when it fails. This field is useful if you do not want to use the
normal RAS lightweight registration procedure. This option is
normally off and must be enabled only it the XT Codec Unit
administrator is sure that the gatekeeper sends the IRQ
messages. If not, the XT Codec Unit unregisters and registers
at every Registration expiration Time.
Authentication If Authentication is enabled, the related fields must be
defined. If it is not enabled, the four text fields (Mode, Gatek.
ID, User name, Password) are greyed.
Mode Automatic, MD5, H.235 annex D - If set to Automatic, the XT
Codec Unit selects the best mode according to the
gatekeeper.
Gatek. ID Gatekeeper H.323 identifier. Ask the network administrator.
User name The network administrator must pre-configure the User name
in the gatekeeper.
Password The network administrator must pre-configure the Password
in the gatekeeper.
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