Hello,
I am looking at the guide for this and found the following:
http://www.cisco.com/en/US/partner/docs/voice_ip_comm/unity/5x/networking/guide/ex/5xcunet030e.html#wp1050502
Enabling Cross-Server Live Reply and Entering the Pilot Numbers of Destination Cisco Unity Servers
Do the following procedure on each Cisco Unity server in the dialing domain. If the system is using failover, do the following procedure on both the primary and secondary server, because most of the settings on the Network > Dialing Domain Options page are stored in the registry. (Registry settings are not replicated to the secondary server.)
To Enable Cross-Server Live Reply and to Enter the Pilot Numbers of Destination Cisco Unity Servers
You might just verify this has been done on the Secondary also.
Thanks,
Scott