I hope this maybe an easy one but I can't get it sorted.
I am trying to do the following when an incoming call comes in.

Step 1
Rings at Ext 700 only

Step 2
Rings at Ext 700 and 701

Step 3
Rings at Ext 700, 701, 702 and 703.

I can get a 2 step to work but cant seem to get a 3rd step to work.

These are BRI trunks and can either DIL to 700 or be normal trunks, (there are another set of BRI for DID)

Any help would be appreciated.
Thanks
Scar.