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Example flow client DNS configuration server U-NAPTR query U-NAPTR resp SRV query SRV resp If no U-NAPTR records configuration for the domain HTTP GET 401 Unauthorized HTTP GET (credentials) 200 OK (bootstrap document) HTTP GET 200 OK (configuration object) 1. discovery of the configuration server 2. retrieving configuration bootstrap document User enters SIP AoR and digest password 3. retrieving configuration object |