On Tue, Mar 16, 2010 at 2:10 PM, Brian West <brian@freeswitch.org> wrote:

A is ingress to the switch.. B is egress from the switch... remember each bridged call consists of two legs. But their are cases that can blur those lines.

FYI, this is a good piece of information. I added it explicitly to the call legs wiki page that we just started:
http://wiki.freeswitch.org/wiki/Call_Legs

If anyone else has something to add by all means do so.
-MC