%% You should probably cite rfc7195 instead of this I-D. @techreport{ietf-mmusic-sdp-cs-11, number = {draft-ietf-mmusic-sdp-cs-11}, 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-mmusic-sdp-cs/11/}, author = {Miguel Angel GarcĂ­a and Simo Veikkolainen}, title = {{Session Description Protocol (SDP) Extension For Setting Up Audio and Video Media Streams Over Circuit-Switched Bearers In The Public Switched Telephone Network (PSTN)}}, pagetotal = 35, year = 2012, month = may, day = 14, abstract = {This memo describes use cases, requirements, and protocol extensions for using the Session Description Protocol (SDP) Offer/Answer model for establishing audio and video media streams over circuit-switched bearers in the Public Switched Telephone Network (PSTN).}, }