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ABNF for SIP:  Uniform Resource Identifiers

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

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

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

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header   =
hname   "="   hvalue
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hname   =
1*( hnv-unreserved   /   unreserved   /   escaped )
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hvalue   =
*( hnv-unreserved   /   unreserved   /   escaped )
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hnv-unreserved   =
"["   /   "]"   /   "/"   /   "?"   /   ":"   /   "+"   /   "$"
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