%% You should probably cite rfc8760 instead of this I-D. @techreport{ietf-sipcore-digest-scheme-04, number = {draft-ietf-sipcore-digest-scheme-04}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-ietf-sipcore-digest-scheme/04/}, author = {Rifaat Shekh-Yusef}, title = {{The Session Initiation Protocol (SIP) Digest Authentication Scheme}}, pagetotal = 8, year = 2019, month = may, day = 28, abstract = {This document updates the Digest Access Authentication scheme used by the Session Initiation Protocol (SIP) to add support for more secure digest algorithms, e.g. SHA-256 and SHA-512-256, to replace the broken MD5 algorithm.}, }