How to use bpstart_notify/bpend_notify with oracle policy.

Hello ,

Situation :

I need to check FT connection status every time before RMAN backup starts from client which is multi-streamed. How do we do this using bpstart_notify/bpend_notify.

Is there any way to do this with out editing RMAN script ?????(I know we can put this inside RMAN script) but I want to use only bpstart_notify/bpend_notify scripts for this purpose.

For file system backups..It is working but how to call bpstart_notify/bpend_notify scripts before RMAN bakcup starts...

Please give any ideas/suggestions....