At the same time while outgoing messages are sending to
emergency response units, Control Center System will send the
warning message in outgoing direction to the effected citizens
with pervasive communications as shown in Figure 2. Caller
preference in SIP allows citizens to express personal
preference about warning messages due to privacy concern on
non-urgent messages. SIP messaging will be used to notify all
citizens on their preferring devices. Our three extended
directions are shown with solid arrows in Figure 2.