I have a CUCM 6.1 (5) Cluster and Unity Conection.
The proble is When the publisher is Down and subscriber works, the user press VM Button is not available.
But when the publisher is work and the user is avialable.
On the unity I configure in the telephony integration
Port Group th e Two servers of CUCM Cluster.
and The Phone system The two AXL Servers
and restart the servers.