%% You should probably cite rfc8119 instead of this I-D. @techreport{mohali-dispatch-cause-for-service-number-13, number = {draft-mohali-dispatch-cause-for-service-number-13}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-mohali-dispatch-cause-for-service-number/13/}, author = {Marianne Mohali and Mary Barnes}, title = {{Session Initiation Protocol (SIP) Cause URI parameter for Service Number translation}}, pagetotal = 11, year = 2017, month = jan, day = 26, abstract = {RFC4458 (SIP URIs for applications) defines a "cause" URI parameter, which may appear in the Request-URI of a SIP request, that is used to indicate a reason why the request arrived to the User Agent Server (UAS) receiving the message. This document creates a new predefined value for the "cause" URI parameter to cover service number translation for cases of retargeting due to specific service action leading to the translation of a called service access number. This document also provides guidance, which was missing in RFC4458, for using the "cause" URI parameter within the History-Info header field since this use is mandatory in some IP networks' implementations. This document updates RFC4458.}, }