RFC 8119

SIP "cause" URI Parameter for Service Number Translation, March 2017

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Status:
INFORMATIONAL
Updates:
RFC 4458
Authors:
M. Mohali
M. Barnes
Stream:
IETF
Source:
NON WORKING GROUP

Cite this RFC: TXT  |  XML

DOI:  10.17487/RFC8119

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Abstract

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.


For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 8729.