Chapter 7 Zone Paging ConfigurationPaging Setup and Operation with Clusters82 Application Gateway Administration GuidePaging Setup and Operation with ClustersWhen you add an Application Gateway to a cluster, the zones on thatApplication Gateway are replaced by the cluster-wide zone list. Therefore,when you configure Zone Paging for a cluster it is best to follow thesegeneral steps:1. Configure each Application Gateway to be included in the cluster,including the IP/DN mapping, and synchronization.2. Add all member Application Gateways to the cluster.3. Synchronize all Application Gateways in the cluster.4. Synchronize each Application Gateway with its associated call server.5. Create the zones to be used by the cluster.Zone Paging operation with a cluster is the same as with a singleApplication Gateway, except as follows:• For zone paging across a cluster, multicasting must be enabled on therouter and each Application Gateway must have a different multicastIP address range specified on the Operation > Voice Office > IP Phonepage of the Administration Tool• The Application Gateway that initiates a page is responsible forpushing paging requests such as “start page” and “end page” to therest of the cluster.• On receiving a “start page” request, an Application Gateway confirmswhether the zone is available (not in use). If an Application Gatewaydoes not reply to a “start page” request, the page is not pushed to thatApplication Gateway (it is likely offline).• Once a page starts, each cluster member listens for RTP traffic on theRTP port. Each cluster members forward the page to and managedpaging operation for its registered phones.
