MacBook Air (M2, 2022) problem with connecting to external display systems using USB C

What video protocol does the system use? The USB-C ports on a Mac can send DisplayPort and Thunderbolt video. macOS does not natively send video over USB. If Yealink is a USB video system, then you would need an extension from them to make it work. Out of the box, an Apple Silicon Mac will not load legacy third-party system extensions.

If that system uses a legacy system extension, you have to reduce security on the M2 Macs in order to load it: Startup Disk security policy control for a Mac with Apple silicon - Apple Support

However, I don't see anything on their site which even hints at support for macOS. The diagrams show "USB audio and video" so it makes me think it is sending video over USB, not a normal video protocol. DisplayLink makes software to connect USB video, but I don't know if it works on Apple Silicon (or Monterey in general).

I have noted that sometimes display manufacturers have USB-C like ports on the back of their display, when in fact they are thunderbolt ports. Do not use standard USB-C cables used for simple data transfer between Android and Mac. You need USB-C cables with the lightning icon on the tips, which carry video and data and power. Some only carry data and power and do not have the lightning bolt logo on their connector. http://www.macsales.com/ sells such cables if you lost the one supplied by the monitor vendor.

Thanks for that info. I wasn't aware of that possibility.