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" HCOLON challenge

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

3GPP TS 24.229 – Clause 7.2A.1

auth-param =

1#( integrity‑key / cipher‑key )

integrity-key =

"ik" EQUAL ik‑value

cipher-key =

"ck" EQUAL ck‑value

ik-value =

LDQUOT *( HEXDIG ) RDQUOT

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