Modified the end of Section 3.2 to clarify that there is no semantic
relationship between the MA and flow concepts. Modified text is in the following
paragraph:

   In general, the state associated with C-mode messaging to a
   particular peer (signalling destination address, protocol and port
   numbers, internal protocol configuration and state information) is
   referred to as a messaging association (MA).  MAs are totally
   internal to GIST (they are not visible to signalling applications).
   Although GIST may be using an MA to deliver messages about a
   particular flow, there is no direct correspondence between them: the
   GIST message routing algorithms consider each message in turn and
   select an appropriate MA to transport it.  There may be any number of
   MAs between two GIST peers although the usual case is zero or one,
   and they are set up and torn down by management actions within GIST
   itself.