** Shares of Norwood Systems NOR.AX rise 35% to A$0.027, their highest level since Jan. 3
** AI firm secures five-year contract, valued at A$2.98 mln ($1.90 mln), with Singtel-owned SING.SI telco Optus
** Contract to replace Optus' existing voicemail system with NOR's CogVoice voicemail platform
** Stock gained as much as 75% to A$0.035 in early trade, its largest intraday pct gain since mid-August 2017
** More than 6.1 mln shares change hands, 41 times its 30-day avg volume
** Stock down ~15.2% YTD, including current session's moves
($1 = 1.5672 Australian dollars)
(Reporting by Nikita Maria Jino in Bengaluru)
((Nikita.Jino@thomsonreuters.com))