A Simpler Method for Resolving Alert-Info URNs
RFC 8433, “A Simpler Method for Resolving Alert-Info URNs”, is an Informational document published in August 2018 by D. Worley. The canonical text is published by the RFC Editor.
Abstract
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.
What “Informational” means
Published for the general information of the community. It does not define an IETF standard and carries no standards-track status.
The canonical text of RFC 8433 is hosted at rfc-editor.org. Available in TXT,HTML.
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- RFC 8434 Requirements for Parallel NFS Layout Types
- RFC 8431 A YANG Data Model for the Routing Information Base
- RFC 8435 Parallel NFS Flexible File Layout
- RFC 8430 RIB Information Model
- RFC 8436 Update to IANA Registration Procedures for Pool 3 Values in the Differentiated Services Field Codepoints Registry
- RFC 8429 Deprecate Triple-DES and RC4 in Kerberos
- RFC 8437 IMAP UNAUTHENTICATE Extension for Connection Reuse