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SIP URI Advertisement Format
Service instance name: Instance.Service.Domain
Instance = ( SIP-URI / SIPS-URI ) [ SP description ]
Service = “_sipuri._udp” / “_sipuri._tcp” / “_sipuri._sctp”
E.g.) sip:bob@example.com - PDA._sipuri._udp.local.
Contact TXT record attribute
Similar to Contact SIP header except:
It contains only a single URI
Non-SIP URIs are not allowed
UA capabilities advertised via field parameters (RFC3840)
PPT Version