Usually when I initiate a voice call with someone (using XMPP accounts
with jit.si) the call is established, I can immediately hear the other
party, but they cannot hear me until a few (max. 10) seconds later,
when the "lock" icon switches to "locked". Presumably Jitsi is not
sending any audio/video down the line before it can establish a secure
channel which is commendable, but how does that explain the fact I can
hear the other party just fine?
Also, on 10% of the calls I've had so far (i.e. 2 out of 20) the
"lock" icon has remained unlocked throughout the call. I understand
this to mean that a secure channel has somehow failed to be
negotiated. Is there anything I can do at that point to diagnose the
problem? What is the suggested response? Hang up and re-dial?