User-Name = "test", Digest-Response = "631d6d73147add2f9e437f59bbc3aeb7", Digest-Realm = "testrealm", Digest-Nonce = "1234abcd", Digest-Method = "INVITE", Digest-URI = "sip:5555551212@example.com", Digest-Algorithm = "MD5", Digest-User-Name = "test", Message-Authenticator = ""