1.4Information flow diagrams

       Information flow diagrams for user-to-user signalling  service  call
setup, service usage and call release are shown in Figures 1-2/Q.87 
to 1-10/Q.87.

       Figure 1-2/Q.87 shows a successful use of UUS Service 1 in  a  point-to-
       point configuration;

       Figure 1-3/Q.87 shows a successful use of UUS Service 1 in  a  point-to-
       multipoint configuration;

       Figure 1-4/Q.87 shows a successful use of UUS Service 2 in  a  point-to-
       point configuration;

       Figure 1-5/Q.87 shows an unsuccessful use of UUS Service 2 in  a  point-
       to-multipoint configuration;

       Figure 1-6/Q.87 shows a successful use of UUS Service 3  requested  and
       essential;

       Figure 1-7/Q.87 shows a successful use of UUS Service 3  requested  and
       not essential;

       Figure 1-8/Q.87 shows a successful use of UUS Service  3  requested
       during the active phase;

       Figure 1-9/Q.87 shows a successful use of UUS Service  3  requested
       during the active phase by the called party;

       Figure 1-10/Q.87 shows a UUS service requested in  a  point-to-multipoint
       configuration.