Cluster

A Cluster is a collection of SCCP clients and a CallManager. The CallManager in the cluster knows about all SCCP clients in the cluster. There can be more than one CallManager for backup in a cluster. CallManager behavior varies in each of the following cluster scenarios:

• Intra-Cluster, in which the CallManager knows about each SCCP client, and the call is between SCCP clients of the same cluster.
• Inter-Cluster, in which the CallManager needs to communicate with another CallManager using H.323 for call setup.
• Inter-Cluster calls using the gatekeeper for admission control and address resolution.

  CallManager behavior also varies with calls between an SCCP client and a phone in a public switched telephone network (PSTN), and with calls between an SCCP client and a phone in another administrative domain that is using H.323.

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