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ABNF for SIP Headers

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SIP Header — Identity

RFC 8224 – Section 4

Identity =
"Identity"  HCOLON  signed‑identity‑digest  SEMI  ident‑info  *( SEMI  ident‑info‑params )
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signed-identity-digest =
1*( base64‑char /  "." )
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ident-info =
"info"  EQUAL  ident-info-uri
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ident-info-uri =
LAQUOT  absoluteURI  RAQUOT
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ident-info-params =
ident‑info‑alg /  ident‑type /  ident‑info‑extension
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ident-info-alg =
"alg"  EQUAL  token
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ident-type =
"ppt"  EQUAL  token
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ident-info-extension =
generic‑param
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base64-char =
ALPHA /  DIGIT /  "/" /  "+"
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