div class=trans-pagebuttonPage 1button div class=trans-image a href=https:reader043fdocumentsnetreader043viewer20220410215ed10298fbddcf49463f0af8html5page1jpg target=_blank amp-img class=trans-thumb alt=Page 1: Entropia IV Key Product Features Telephony and class features Comprehensive tone generation and detection: DTMF USA and Japan MF RIR2 COT call-process tones with national variations src=https:reader043fdocumentsnetreader043viewer20220410215ed10298fbddcf49463f0af8html5thumbnails1jpg width=142 height=106 layout=responsive amp-imga divdivdiv class=trans-pagebuttonPage 2button div class=trans-image a href=https:reader043fdocumentsnetreader043viewer20220410215ed10298fbddcf49463f0af8html5page2jpg target=_blank amp-img class=trans-thumb alt=Page 2: Entropia IV Key Product Features Telephony and class features Comprehensive tone generation and detection: DTMF USA and Japan MF RIR2 COT call-process tones with national variations src=https:reader043fdocumentsnetreader043viewer20220410215ed10298fbddcf49463f0af8html5thumbnails2jpg width=142 height=106 layout=responsive amp-imga divdiv