CUCM 7 does not support 3rd-party agents of any kind. You would need to DRS backup to an off-box server which has your Netbackup installed.
Unity is more forgiving than the other applications. A CCO search will tell you what is/is not supported for 3rd-party backup agents.
UCCX is less forgiving. You'll need to double check this status on CCO as well.
Nonetheless, again you could employ the "backup server" approach and backup the systems directly to that box which has Netbackup loaded on it and then use that to backup that box and move backups to tape/offsite/whatever you choose to do.
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...