The Lotus Sametime Unified Telephony redundant configuration can be deployed as geographically co-located or separated node configuration. The separated configuration can be distinguished further, into whether nodes are in the same subnet, diffferent subnets or connected only via layer-3 (IP).
Enterprises have the option to define more than one default gateway—specifically, the management, signaling, and billing/CDR redundant connections from each node. However this capability should only be deployed if an enterprise does not permit routing between subnets on its network. Always contact your next level of support for assistance in configuring this feature.
Parent topic: Cluster Redundancy
Cluster Redundancy with Geographic Node Separation
Cluster Redundancy with Co-Located Nodes