Cisco Cisco Expressway
Multiple clustered network elements
In this scenario there are multiple clusters of each network element.
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Jabber clients can access their own cluster via any route
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Expressway-C uses round robin to select a node (publisher or subscriber) when routing home cluster
discovery requests
discovery requests
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Each combination of Unified CM and IM and Presence Service clusters must use the same domain
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Intercluster Lookup Service (ILS) must be active on the Unified CM clusters
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Intercluster peer links must be configured between the IM and Presence Service clusters, and the
Intercluster Sync Agent (ICSA) must be active
Intercluster Sync Agent (ICSA) must be active
Hybrid deployment
In this scenario, IM and Presence services for Jabber clients are provided via the WebEx cloud.
Unified Communications Mobile and Remote Access via Cisco Expressway Deployment Guide (X8.5.1)
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Deployment scenarios