In　this　paper,　a　novel　audio　authentication　algorithm　for　mobile　phone　communication　is　proposed.　Nowadays　more　and　more　agreements　are　reached　over　the　mobile　phones.　Unlike　the　traditional　paper　agreements,　whose　integrity　and　authenticity　can　be　guaranteed　by　the　signatures,　the　digital　contracts　made　over　phones　can　be　either　faked　or　edited.　Consequently,　how　to　prove　the　authenticity　and　the　integrity　is　very　critical.　The　proposed　scheme　can　fulfil　the　above　tasks　by　inserting　authentication　information,　the　watermark,　into　sub　bands　based　on　psychoacoustic　analysis.　According　to　the　embedded　watermark,　the　identity　of　the　voice,　as　well　as　the　integrity　of　the　audio　recording　can　be　verified.　Experimental　results　demonstrate　the　effectiveness　of　the　algorithm.　©　2023　IEEE.