If you want to divert your DDI numbers you would need to create a time group without any times.
Go to ‘Time & Dates’, hit ‘NEW’ to create a new time and date route, give the route a name, and save.
Go to Numbers, select the number you want to apply the time and date route to, at the bottom of the page, select ‘add a time route’
Select your time group at the top of the page, then choose your destination (external number & enter mobile) then click save.
Go to "Numbers" - for all DDI numbers you wish to apply number routing to, select "YES" in the drop-down for "Update this number when setting numbers routing"
Go to ‘Feature Codes’ - Create New Feature Code (e.g. *600), and set ‘default destination for calls to this feature code’ to ‘set ruting to time group:’ then select your call route from the drop-down box, click save.
Go to ‘Feature Codes’ - Create New Feature Code (e.g. *601), and set "default destination for calls to this feature code" to "set numbers routing to normal:". Click save.
You should now be able to dial *600 to set the numbers to divert to the entered destination and when you dial *601 it will set the routing back to normal.