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ABNF for SIP
RFC 3261and subsequent RFCs

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

SIP/SIPS URI — headers

in Section 19.1.1 of RFC 3261  and  ABNF in RFC 3261

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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