** Shares of Dubber DUB.AX are up as much as 57.1% at A$0.022, its biggest intraday pct gain since March 11** Co enters agreement with a 'Tier 1 North American telecommunications carrier' ** Co to provide Mobile Voice Recording (MVR) and AI-based conversation analytics; will receive payment of nearly A$4.6 million ($3.04 million) by 3Q26-end** Shares hit the highest level since Aug 26** 35.3 mln shares change hands, 11.7 times 30-day avg** YTD, shares down 37.5%

($1 = 1.5124 Australian dollars)

(Reporting by Nichiket Sunil in Bengaluru)

((Nichiket.Sunil@thomsonreuters.com))