UriSchemes/sip

"sip" is uriReg:schemeName of [
  dc:description """session initiation protocol""";
  is uriReg:specifies of [
    = <http://www.ics.uci.edu/pub/ietf/uri/draft-ietf-mmusic-sip-url-00.txt>;
    dc:title """SIP URL Scheme""";
    dc:creator [
      dca:agentName "H. Schulzrinne"];
    a inet:Draft;
    dc:date "1997-05-14"; ];
]
.

• spec: SIP URL Scheme

ProxyTopic; see IANA registry.----

See also other UriSchemes.

We're using NotationThree here, assuming TheUsualPrefixes.