requirements_and_architecture_for_emergency_calling----Page:18
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Routing proposals
DNS
map civic to labels
e.g., 313.westview-ave.leonia.bergen.nj.us.sos.arpa
store (by reference) geo boundaries
TRIP
similar notion of hierarchical resolution, but not based on numbers
not clear that dynamic updates are particularly useful here
IRIS
XML-based query protocol used for domain name registrar information, but easily generalizable
would need to deal with referrals
uses SRV for redundancy
LDAP
PPT Version