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Routing Requests through an Authentication Service (client redirection model)
INVITE
428 (w/Artifact-or
Assertion))
INVITE (w/Artifact-or-Assertion)
User Agent
sip:alice@local.edu
sip.remote.edu
sip.local.edu
User Agent
INVITE
sip:joe@remote.edu
Joe (or even the Proxy Server) can inspect the Artifact/Assertion
Auth Service attaches Artifact or
Assertion to the SIP message
PPT Version