Cisco Cisco Unified Contact Center Enterprise 9.0(1) Guia Do Desenho

PG side B becomes active and registers all dialed numbers and phones, and call processing 
continues.

To provide full access to state and third-party call control functions again, the agents must log back 
in after their phones have re-homed to subscriber B.

During this failure, any calls in progress at a Unified CCE agent remain active; however, the agent 
will not be able to perform a conference, transfer, or any other Unified CM features until the phone 
re-homes to an active subscriber. Then the agent will be required to log back into Unified CCE. 
When the call is completed, the phone re-homes automatically to the backup Unified CM subscriber.

When Unified CM subscriber A recovers, all idle phones and gateways re-home to it. Active devices 
wait until they are idle before re-homing to the primary subscriber.

PG side B remains active, using the CTI Manager on Unified CM subscriber B.

After recovery from the failure, the PG does not fail back to the A side of the duplex pair. All CTI 
messaging is handled using the CTI Manager on Unified CM subscriber B, which communicates 
with Unified CM subscriber A to obtain phone state and call information.

 shows a failure on PG side A and a failover to PG side B. All CTI Manager and Unified CM 

services continue running normally. The following conditions apply to this scenario:

All phones and gateways are registered with Unified CM subscriber A.

All phones and gateways are configured to re-home to Unified CM subscriber B (that is, B is the 
backup server).

Unified CM subscribers A and B are each running a local instance of CTI Manager.

ICM synchronzation messages
Unified CM intra-cluster messages
JTAPI messages
H323 or MGCP messages
SCCP messages

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Unified CM B

Unified CM A

Fails

Agent PG A

Agent PG B