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SIP UA Discovery using DNS-SD Why? SIP communication within subnet without servers E.g., wireless ad-hoc network, campus LAN Why DNS-Based Service Discovery (DNS-SD)? Widespread implementation: Apple Bonjour, iChat Some SIP UAs already use it: Gizmo, Ekiga Why not SIP multicast? UAs can track peer locations using multicast REGISTER But no query capability New UA won’t discover existing UAs until their registrations are refreshed (up to an hour delay) Not reliable - may miss registrations |