1.4	Information 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.