Cisco Cisco Unified Customer Voice Portal 11.0(1)

Note: In general, this value should not be changed. The H.323 Service configuration tool could
be used to modify the list as needed. If the Call Server list changes, the first Call Server on the
new list will be used.

There is one Call Server list for all calls. As shown in the figure below, the H.323 Service selects
a Call Server as follows:

1. When the H.323 Service starts up, it attempts to connect with the first Call Server in the

list, Call Server W.

2. If Call Server W does not respond, the H.323 Service will go to the next Call Server in

the list, Call Server X.

3. If the H.323 Service can communicate with Call Server X, the next call is handled by that

Call Server.

Note: If a call arrives and Call Servers X, Y, and Z do not respond, the H.323 Service goes back
to the beginning of the list and tries the Call Server at the original starting point (that is, Call
Server W). If the H.323 Service tries all Call Servers and there is no response, an alarm is
generated. The H.323 Service takes itself out of service and refuses calls. It will continue to
communicate with each of the Call Servers and, when one of them is available, goes back in
service.

Figure 31: Call Server

If the Call Server list changes, the first Call Server on the new list will be used. The change will
be used for new calls only.

Configuration and Administration Guide for Cisco Unified Customer Voice Portal Release 4.1(1)