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RFC 8119
Title: SIP "cause" URI Parameter for
Service Number Translation
Author: M. Mohali, M. Barnes
Status: Informational
Stream: IETF
Date: March 2017
Mailbox: marianne.mohali@orange.com,
mary.ietf.barnes@gmail.com
Pages: 12
Characters: 24142
Updates: RFC 4458
I-D Tag: draft-mohali-dispatch-cause-for-service-number-14.txt
URL: https://www.rfc-editor.org/info/rfc8119
DOI: 10.17487/RFC8119
RFC 4458 (regarding 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 updates RFC
4458 by creating 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 RFC 4458, for using the "cause" URI parameter within
the History-Info header field, since this use is mandatory in some IP
networks' implementations.
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