Right. In Jami by default only the host of a conference/rendezvous-point will stream to/from all peers and mix their streams, and other peers normally only stream to/from the conference host. Also Jami can automatically adjust the call's bitrate on the fly depending on the link quality:

https://docs.jami.net/user/faq.html#how-much-bandwidth-do-i-...

Hope this helps. :)