requirements_and_architecture_for_emergency_calling----Page:16
1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21 

Architecture: routing
Can take place at
UAC
outbound proxy
home domain
May be done at multiple levels:
UAC routes to country-level emergency call proxy
country-level proxy routes to state/province, etc.
parts of path may be hidden behind firewall
PPT Version