All those services don't encrypt connections if they include PTSN phone calls or other features. Example: https://help.webex.com/en-us/WBX44739/What-Does-End-to

All those services don't encrypt connections if they include PTSN phone calls or other features. Example: https://help.webex.com/en-us/WBX44739/What-Does-End-to-End-Encryption-Do https://help.webex.com/en-us/WBX44739/What-Does-End-to-End-E...