Call with a registered number to the number of access OPTIROAM specified in section «Home --- Quick Navigation -- Inbound Calls -- Access Numbers» или «CallBack -- Phone Callback» enter service code *8 then the number for call forwarding:
In the international format without the + to the global call forwarding to external number.
3312345567
With 0 at the beginning for redirection to an internal number (Roam Number).
0543892