“contact” • “event” • “route” • “session • “subject” • Address • Authentication • Bluetooth • Busy • Callee • Codec • Communication • Contains • Description • Determine • Duration • Exchange • Expires” • Field • Follow • Found” • Ftp • Handle • Here” • Id” • Identifier • Identifies • Identity • Information • Key • Location • Notification • Ok” • Party • Phone • Port • Provides • Proxies • Recommended • Requests • Response • Service • Session • Set • Situation • Specific • Supported • Updating • When • Which