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ABNF for SIP:  Headers

 

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WWW-Authenticate   =
"WWW-Authenticate"   HCOLON   challenge

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


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