Sessionwire does not promote or advertise the ability to "jam live" or "rehearse live" over the internet - for a very good reason. It will always take a certain amount of time for the signal from one machine to travel to another, and then back again. That "there and back again", in a musical context, must be below a certain length of time or it becomes very difficult and distracting to play in time.
Sessionwire's CTO Robin Leboe has written a great article that explains how latency builds up in a typical call over the internet - you can read it here.
In short, there is latency in the internet connection between two users, there is latency in each machine (video and audio encoding/decoding), high buffer sizes in DAWs result in latency, etc. Before you know it, there can be over 100ms in latency between users - which makes it quite impossible to jam or rehearse live with another person.
At Sessionwire, we promote workflows that help facilitate the recording process - workflows that accommodate the latency.
Recording on the performing side of a Sessionwire connection while the other side listens and gives "real time" feedback, just like being on the other side of the glass in a studio.
The finished files or stems are then transferred to the "producer" or engineer via Sessionwire's file transfer system.
Until the human race makes a breakthrough in the field of quantum entanglement, live jamming over the internet will remain a pipe dream!