This document describes how to change the Unreachable Destination timeout value in a Cisco Unified Customer Voice Portal (CVP) Call Server.
Contributed by Usman Ahmed, and Divin John Cisco TAC Engineers.
Cisco recommends that you have knowledge of these topics:
The information in this document is based on these software versions:
CVP Call server 8.5 or higher
The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.
When CVP Call Server configuration has multiple SIP (Session Initiation Protocol) Elements in a SIP Server group, CVP sends out the INVITE to the server with the highest priority. If the SIP element is down, CVP adds the SIP Element to an Unreachable Destination table. If SIP heart beats(OPTIONS Ping) are not enabled, then SIP element stays in the Unreachable table for 180 seconds.
Sample srv.xml Configuration
In this SIP Server group configuration, SIP Server 192.168.1.1 is the primary and 192.168.1.2 is the secondary server. If the primary server is down, CVP will place it in the Unreachable table for 180 seconds and route all calls to the secondary server. Once 180 seconds are over, CVP will remove the primary server from the Unreachable table and route calls to it.