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Furthermore, the following single points of failure exist in an IPCC Express solution under the specified 
conditions:

Cisco CallManager publisher fails

This failure is an issue only where the publisher is serving as the Domain Controller Directory 
(DCD) server. Primary CTIM failure is not of itself a single point of failure unless there is only one 
Cisco CallManager server or IPCC Express is a co-resident configuration.

IP WAN fails in a centralized call processing model (with IPCC Express at the central site)

Agents at the remote sites lose connectivity to either the IPCC Express application or to the 
Cisco CallManager cluster.

IPCC Express Server fails

If there is an IPCC Express application failure, all IPCC Express subsystems and application 
functions are unavailable, even though CTIM and Cisco CallManager services are running normally.

In all three scenarios, the IPCC Express application's CTI connection to its configured primary CTIM 
fails, thereby affecting call routing and IPCC Express agent connections. The following sections focus 
on anticipated behavior of call routing as well as call and agent availability after the failure. You should 
review these failure cases in order to address and appropriately set user expectations in providing 
redundancy for your IPCC Express system.

In this failure scenario, IPCC Express loses its CTI connection to the primary Cisco CallManager or 
CTI Manager configured for IPCC Express. (See 

For the example in 

, the IPCC Express JTAPI provider is pointing to the Cisco CallManager 

primary (subscriber) server for both its primary Cisco CallManager and CTIM services.

97653

Database

ICD

ICD Agents

CallManager Primary

(subscriber)

CallManager BackUp

(publisher)

Failover approx

500 msec per

device

CTI
SCCP
LDAP