I also tried to make this USSD work, but could not, although I read the docs.

What I would want, is to have two call forwarding shortcuts:
Move all calls to my answering machine after 5s (min) if not answered:
**61*XXXXXXXXX*11*5#
where XXXXXXXX is the phone number to the answering service of my operator for my account.

Move all calls to my answering machine after 30s (max) if not answered:
**61*XXXXXXXXXX*11*30#

Have tried few different things with USSD-widget, but nothing seem to work.
I do not know what network should reply, nor I have seen anything sensible when there has been just echo * script or something.

These call forwards to answering machine used to work in Nokia N95 just having them in Contacts and binding keyboard shortcuts to those two contacts.