Cisco Systems OL-14619-01 manual Cisco Unity Failback, 6-29

Chapter 6 Integrating Cisco Unity with the Phone System

Integrating with Circuit-Switched Phone Systems by Using PIMG or TIMG Units

The connections for a PIMG integration with Cisco Unity failover are shown in Figure 6-16.

Figure 6-16 Connections for a PIMG Integration with Cisco Unity Failover

Phone system

Additional

PIMG units as needed

PIMG unit

LAN/WAN PIMG unit

Digital lines

Network connections

Primary

Cisco Unity server

Secondary

Cisco Unity server

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Cisco Unity Failback

Before failing back from the secondary server to the primary server, you must first disable automatic failover. Otherwise, the PIMG/TIMG units will continue to send INVITE messages to the secondary server for new calls, which will cause failover to occur before failback has completed. Do the following procedure when initiating failback from the secondary Cisco Unity server to the primary server.

To Initiate Failback from a Secondary Cisco Unity Server to the Primary Server

Step 1 On the Windows Start menu, click Programs > Cisco Unity > Failover Monitor.

Step 2 Click Configure.

Step 3 Uncheck the Force Failover If Call Arrives on Inactive Secondary check box, and click OK.

Step 4 Initiate failback, and wait at least 10 seconds.

Step 5 Re-enable automatic failover.

Multiple Integration Support/Branch Office Consolidation

Cisco Unity does not limit the number of PIMG integrations. It is possible, though not practical, to create 144 separate phone system integrations with one port each for a total of 144 ports and 144 PIMG units.

PIMG unit can be placed across a WAN to support circuit-switched phone systems at remote branch office sites. Cisco Unity would be placed at a centralized headquarters, for example, and support circuit-switched phone systems both at headquarters and at branch office sites.

	Design Guide for Cisco Unity Release 5.x
OL-14619-01		6-29