punch the code below into your handset using the dial keypad and then press dial.

**61*905*11*30#

it will say some guff about setting registration and voicemail which should mean you now get 30 secs worth of ringing, before going to answerphone. the number before the last # is the number of time in seconds the phone will ring for, 30 being the supposed maximum ? I haven’t tried it higher or test timed beyond 30 secs perhaps you could feedback on this ?

( i dont think this is handset specific but it is I beleive network specific so try it out at your own risk )