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ABNF for SIP Headers

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SIP Header — WWW-Authenticate

Section 20.44 of RFC 3261  and  ABNF in RFC 3261

WWW-Authenticate =
"WWW-Authenticate"  HCOLONchallenge

; SIP example:
; WWW‑Authenticate: Digest realm="atlanta.example.com", qop="auth",
;   nonce="84f1c1ae6cbe5ua9c8e88dfa3ecm3459",
;   opaque="", stale=FALSE, algorithm=MD5

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auth-param =
integrity-key =
"ik"  EQUALik‑value
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cipher-key =
"ck"  EQUALck‑value
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ik-value =
LDQUOT  *( HEXDIG )  RDQUOT
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ck-value =
LDQUOT  *( HEXDIG )  RDQUOT

; IMS example:
; SIP/2.0 401 Unauthorized
; ...
; WWW-Authenticate: Digest realm="registrar.home1.net",
;   nonce=base64(RAND + AUTN + server specific data),
;   algorithm=AKAv1‑MD5,
;   ik="00112233445566778899aabbccddeeff",
;   ck="ffeeddccbbaa11223344556677889900"
; CSeq: 1 REGISTER

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