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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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headers   =
"?"   header   *( "&"   header )

; examples:
;    sip:atlanta.com;method=REGISTER?to=alice%40atlanta.com
;    sips:alice@atlanta.com?subject=project%20x&priority=urgent


header   =
hname   "="   hvalue

hname   =
1*( hnv-unreserved   /   unreserved   /   escaped )

hvalue   =
*( hnv-unreserved   /   unreserved   /   escaped )

hnv-unreserved   =
"["   /   "]"   /   "/"   /   "?"   /   ":"   /   "+"   /   "$"