Session Initiation Protocol (SIP) Cause URI parameter for Service Number translation

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Document Type None Internet-Draft (individual)
Last updated 2015-01-21
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[RFC4458] defines a "cause" URI parameter as having predefined values for Redirecting reasons as a mapping from ITU-T Q.732.2-5 Redirecting Reasons. The "cause" URI parameter is to be used in SIP or SIPs URI. In particular, it may appear in the History-Info header field defined in [RFC7044] that must be added in retargeted requests. This specification creates a new predefined value for cases when the retargeting is caused by a specific service action leading to a called service access number translation. This document updates [RFC4458].


Marianne Mohali (

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