Asking for vendor to help is quite slow as you need to send out an email and wait for them to assign for an engineer.
Base on what I've learn from the engineer, hope this simple tutorial can ease your daily task.
Requirement :
1) Avaya Site Administration (software)
2) Admin ID & Password for the Avaya System
From my point of view how this Avaya system work are :-
Extension A (for e.g. 333) to forward the call when no pickup you'll need to assign a Coverage Path
When you type in display station xxx (xxx = ext number) , you able to check the station are assign to which coverage path.
I suggest you check the coverage path does it share with others station before you make any changes.
Type list coverage path to get a list of coverage path.
On the left are the coverage path number, you may add a new coverage path by type in add coverage path
Once you have selected the coverage path you wanted to use; type in change station xxx (change = edit, display = view)
change the coverage path number to the one you have selected / wish to modify
Type change coverage path x (x = path number)
After 1 rings if not answer it will forward the call to Point 1 for X number of ring and it will end the transfer at the last point of your entry. From the example, the call will be terminated if there is still no answer from Point 2.
From my example :-
Station A forward to Station B to Station C. If there is a call to Station B it will not forward to Station C as the call forwarding are base on the coverage path. Unless you share the same coverage else each have their own settings.