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ABNF for SIP
RFC 3261and subsequent RFCs

SIP-URI   userinfo   hostport   uri‑parameters   headers   absoluteURI   tel‑URI

SIP/SIPS URI — absoluteURI

see  ABNF in RFC 3261

absoluteURI =
scheme  ":"  ( hier‑part /  opaque‑part )
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scheme =
ALPHA  *( ALPHA /  DIGIT /  "+" /  "-" /  "." )
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hier-part =
net‑path /  abs‑path )  [ "?"  query ]
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net-path =
"//"  authority  [ abs‑path ]
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abs-path =
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query =
*uric
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authority =
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srvr =
[  [ userinfo  "@" ]  hostport ]
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reg-name =
1*( unreserved /  escaped /  "$" /  "," /  ";" /  ":" /  "@" /  "&" /  "=" /  "+" )
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path-segments =
segment  *( "/"  segment )
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segment =
*pchar  *( ";"  param )
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param =
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pchar =
unreserved /  escaped /  ":" /  "@" /  "&" /  "=" /  "+" /  "$" /  ","
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opaque-part =
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uric =
reserved /  unreserved /  escaped
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uric-no-slash =
unreserved /  escaped /  ";" /  "?" /  ":" /  "@" /  "&" /  "=" /  "+" /  "$" /  ","
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