%% You should probably cite rfc8760 instead of this I-D. @techreport{ietf-sipcore-digest-scheme-12, number = {draft-ietf-sipcore-digest-scheme-12}, 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/12/}, author = {Rifaat Shekh-Yusef}, title = {{The Session Initiation Protocol (SIP) Digest Authentication Scheme}}, pagetotal = 9, year = 2019, month = oct, day = 30, abstract = {This document updates RFC 3261 by updating 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.}, }