CHAPTER 4. H.323 Gateway Management
422
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Alternative Gatekeeper Procedure
H.323 gateway processes the alternate gatekeeper field(altGKList, altGKList)
in GatekeeperConfirm(GCF), GatekeeperRejection(GRJ),
RegistrationConfirm(RCF) and RegistrationRejection(RRJ) Message; and
H.323 gateway enables interworking with other gatekeeper at GRQ and RRQ
stage. This function provides redundancy when the gatekeeper interworking
over H.323 network fails; and the system availability, redundancy and
scalability should be implemented at the gatekeeper level.
y
AltGKList in GCF Messages
−
The alternative gatekeeper list currently managed by H.323 gateway is
replaced by the list in this field. In case of the empty AltGKList, the
alternative gatekeeper list managed by H.323 gateway is kept.
y
AltGKList in RCF Messages
−
The alternative gatekeeper list currently managed by H.323 gateway is
replaced by the list in this field. In case of the empty AltGKList, the
alternative gatekeeper list managed by H.323 gateway is cleared.
y
AltGKInfo in GRJ Messages
−
The alternative gatekeeper list currently managed by H.323 gateway is
replaced by the list in this field. H.323 gateway selects a gatekeeper with
high priority out of the list to perform the RAS registration procedure.
If no response is received from the selected gatekeeper, it selects the
gatekeeper with the next higher priority to perform the RAS registration
procedure; and after the entire alternative gatekeeper list is selected, the
RAS registration procedure is performed with the secondary gatekeeper
or original gatekeeper according to the Figure 29.7.
y
AltGKInfo in RRJ Messages
−
The alternative gatekeeper list currently managed by H.323 gateway is
replaced by the list in this field. H.323 gateway selects a gatekeeper with
high priority out of the list to perform the RAS Registration procedure.
If no response is received from the selected gatekeeper, it selects the
gatekeeper with the next higher priority to perform the RAS registration
procedure; and after the entire alternative gatekeeper list is selected, the
RAS registration procedure is performed with the secondary gatekeeper
or original gatekeeper according to the Figure 29.7.
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