Generally, audio streaming uses about 100 kbps (0.1 Mbps), while high-definition video conferencing uses about 2 Mbps. There are some more detailed numbers here:
https://www.speedguide.net/faq/what-...nferencing-513
The caveat with most residential broadband is that the upstream (upload) bandwidth is much lower, sometimes 10 times lower than download. They also quote you "up to 50 Mbps", which means that it is shared/oversubscribed bandwidth that during peak times may crawls down to much lower speeds. Just some things to watch out for.
Audio conferencing should not be a problem on broadband connections though, it should be more than enough.
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