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ABNF for SIP:   Uniform Resource Identifiers

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userinfo     hostport     uri_parameters     headers     absoluteURI     tel_URI

RFC 3261 – Section 25, p.223

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absoluteURI   =
scheme   ":"   ( hier-part  /  opaque-part )

scheme   =
ALPHA   *( ALPHA   /   DIGIT   /   "+"   /   "-"   /   "." )

hier-part   =
( net-path  /  abs-path )   [ "?"   query ]

net-path   =
"//"   authority   [ abs-path ]

abs-path   =
"/"   path-segments

query   =
*uric

authority   =
srvr  /  reg-name

srvr   =
[  [ userinfo   "@" ]   hostport  ]

reg-name   =
1*( unreserved   /   escaped   /   "$"   /   ","   /   ";"   /   ":"   /   "@"   /   "&"   /   "="   /   "+" )

path-segments   =
segment   *( "/"   segment )

segment   =
*pchar   *( ";"   param )

param   =
pchar   =
unreserved   /   escaped   /   ":"   /   "@"   /   "&"   /   "="   /   "+"   /   "$"   /   ","

opaque-part   =
uric   =
reserved   /   unreserved   /   escaped

uric-no-slash   =
unreserved   /   escaped   /   ";"   /   "?"   /   ":"   /   "@"   /   "&"   /   "="   /   "+"   /   "$"   /   ","