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Choices, Choices, Choices Identity at the Application level Use a stable name space that is mapped to a locator (using the DNS) DNS incremental updates Allow indirection and referral via DNS NAPTR records Generic identity ornamented with service-specific mappings ENUM Use application agents to provide stable rendezvous points For example: sip:gih@sip.apnic.net Issues: Can the DNS support dynamic interaction at a suitable scale and speed? Are a family of diverse application-specific identities desireable (cross-application referral and hand-over) Can we stop application designers from creating NAT-agile locator-independent application-specific solutions that rely on an application-specific identity space? |