I have a request from one customer to configure the following scenario:
If somebody call the manger does not take the call the call will be forwarded to his secretary, if his secretary does not answer, the call will be forwarded to the manager's Voice Mail.
I have one solution but I need to know if somebody has better solution?
Unity 5 and 7 do have a new setting on which you can have Unity to choose between the original called number(manager) or the last redirecting number(secretary) to choose the mailbox.
The default is to use the original called number which is the legacy behavior in 3.x and 4.x where there was no option to choose.
You can read the whole explanation of that setting here:
IP Telephony: Call forward
In your case you don't need to change anything, just let the system work as it should.
if this helps, please rate