Unless you and the teacher both have rock solid, low latency internet connections, you'll probably have a better time if you split video from audio.
The best is if you can both use real landlines for audio. Audio bandwidth is terrible (8kHz), but latency and jitter should be very low. As I understand it, if you can get ISDN audio calling, that's even better, but like good luck convincing your teacher and your phone company (and their phone company) to get that installed.
If you don't have real landlines available, try voip landlines (using G.711u or G.722.2 if that's supported) or cell phones.
Whatever you do, definitely don't use anything wifi or bluetooth at all.
Unless you and the teacher both have rock solid, low latency internet connections, you'll probably have a better time if you split video from audio.
The best is if you can both use real landlines for audio. Audio bandwidth is terrible (8kHz), but latency and jitter should be very low. As I understand it, if you can get ISDN audio calling, that's even better, but like good luck convincing your teacher and your phone company (and their phone company) to get that installed.
If you don't have real landlines available, try voip landlines (using G.711u or G.722.2 if that's supported) or cell phones.
Whatever you do, definitely don't use anything wifi or bluetooth at all.