Yes, Jami calls are p2p whenever possible, and TURN is used when not (e.g. due to overly restrictive firewalls).
Yes, Jami supports conferencing. One can add additional participants to a 1-on-1 call on the fly, effectively making it a conference. Alternatively, one can enable rendezvous mode from account settings, in which case incoming calls to that account will be added to a conference (similar to a Jisti room).
Yes, Jami supports conferencing. One can add additional participants to a 1-on-1 call on the fly, effectively making it a conference. Alternatively, one can enable rendezvous mode from account settings, in which case incoming calls to that account will be added to a conference (similar to a Jisti room).