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Call processing must never occur on a Cisco Unified Communications Manager publisher, even in failover conditions.

SRST is a Cisco Voice Gateway feature that allows agent phones and their associated CTI Desktop to home to the local SRST gateway in the event that the gateway loses connection with the Cisco Unified Communications Manager that is controlling it.

When a Cisco Unified Contact Center Enterprise VRU PG fails, all calls in queue on that Cisco Unified IP IVR are dropped unless there is a default script loaded on the Cisco Unified IP IVR.

If a Cisco Unified Contact Center Enterprise child system loses a WAN connection with the parent Cisco Unified ICM, it is not possible under any circumstances to queue newly arrived calls at that child.