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Participating Proxies Inspects the Proxy-Path AVP if present If its own identity is not present, append it if it wants to participate If its own identity is present remove it and use the next enumerated identity for destination-host and/or destination-realm. Destination Inspects the Proxy-Path AVP if present If its own identity is not present, append it if it wants to participate If its own identity is present then it must be the only identity left in the stack More detailed message flow present in the draft |