EXAMPLES OF PNNI SIGNALING
Figure 9-15 shows how PNNI signaling is used to set up and tear down a connection. PNNI signaling takes advantage of the information gathered in the routing operations explained in the first part of this chapter. It knows of an efficient route from the calling to the called party.
Figure 9-15. PNNI Connection Set Up and Tear Down
The events in Figure 9-15 are straightforward. The SETUP message is relayed in the forward direction from user A (the preceding user) across three networks to user B (the succeeding user). Each recipient network of this message must return a CALL PROCEEDING message to inform the sending ...
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