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RFC 8433
Title: A Simpler Method for Resolving
Alert-Info URNs
Author: D. Worley
Status: Informational
Stream: Independent
Date: August 2018
Mailbox: worley@ariadne.com
Pages: 45
Characters: 89902
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-worley-alert-info-fsm-10.txt
URL: https://www.rfc-editor.org/info/rfc8433
DOI: 10.17487/RFC8433
The "alert" namespace of Uniform Resource Names (URNs) can be used in
the Alert-Info header field of Session Initiation Protocol (SIP)
requests and responses to inform a voice over IP (VoIP) telephone
(user agent) of the characteristics of the call that the user agent
has originated or terminated. The user agent must resolve the URNs
into a signal; that is, it must select the best available signal to
present to its user to indicate the characteristics of the call.
RFC 7462 describes a non-normative algorithm for signal selection.
This document describes a more efficient alternative algorithm: a
user agent's designer can, based on the user agent's signals and
their meanings, construct a finite state machine (FSM) to process the
URNs to select a signal in a way that obeys the restrictions given in
the definition of the "alert" URN namespace.
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