Yutthana Srisavat explains why and how he adapted his teaching to instruct using just his voice via a messenger app, as a way to keep classes accessible to remote students.
https://www.timeshighereducation.com/campus/how-teach-online-voice-only
DawsonITE is a blog devoted to Educational Technology. It's compiled by Rafael Scapin, Coordinator of Educational Technology at Dawson College in Montreal (Canada).