Answer:
The last recorded calls show the importance of having an integrated national communication system.
Step-by-step explanation:
During the September 11 attacks, it was confirmed how the communication process in the USA should be revised and modified in order to promote a quick service to citizens. This is because when the attack occurred, a large number of people called emergency services. The volume of calls was so great that it prohibited the lines, making it impossible to make the call.
The last calls recorded that day, express when the service was urgent and needed the movement of several public agencies, which also did not have an integrated communication system.