Information Technology Reference
In-Depth Information
gatekeeper
There are several methods of providing communication between CUCM clusters, the PSTN, PBXs, and other telephony networks,
including the following:
Non-gatekeeper-controlled intercluster trunks
Gatekeeper-controlled intercluster trunks
Gatekeeper-controlled H.225 trunks
SIP trunks
Non-gatekeeper-controlled intercluster trunks are relatively straightforward. They are used in distributed networks where there are no
gatekeepers, and involve the configuration of trunk connections between the local CUCM cluster and each remote CUCM cluster. The
fact that separate trunks are required between the local CUCM cluster and each remote cluster when using non-gatekeeper-controlled
intercluster trunks leads to a proliferation of trunks if there are a large number of clusters.
Gatekeeper-controlled intercluster trunks and gatekeeper-controlled H.225 trunks are described in this section, and SIP trunks are
detailed in the next section.
The implementation of gatekeeper-controlled intercluster trunks is a more scalable method of provisioning intercluster communication
than non-gatekeeper-controlled intercluster trunks, because separate trunk connections are not required for each remote CUCM
cluster.
Gatekeepers are devices that can provide functions including admission control, bandwidth control, zone management, and address
resolution. Gatekeeper-controlled communication can be implemented by configuring either of the following:
Gatekeeper-controlled intercluster trunks: Provide connectivity between CUCM clusters in a distributed call-processing
network
Gatekeeper-controlled H.225 trunks: Provide connectivity to Cisco CUCM clusters and H.323 networks
 
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