URNs for the Alert-Info Header Field of the Session Initiation Protocol (SIP) (RFC7462)
Original Publication Date: 2015-Mar-01
Included in the Prior Art Database: 2015-Mar-26
Internet Society Requests For Comment (RFCs)
L. Liess: AUTHOR [+6]
The Session Initiation Protocol (SIP) [RFC3261] includes a means to suggest to a User Agent (UA) a particular ringback tone or ring tone to be used during session establishment. In [RFC3261], this is done by including a URI, in the Alert-Info header field, that specifies a reference to the tone. The URI is most commonly the HTTP URL to an audio file. On the receipt of the Alert-Info header field, the UA may fetch the referenced ringback tone or ring tone and play it to the user.
Internet Engineering Task Force (IETF) L. Liess, Ed. Request for Comments: 7462 R. Jesske Updates: 3261 Deutsche Telekom AG Category: Standards Track A. Johnston ISSN: 2070-1721 Avaya D. Worley Ariadne P. Kyzivat Huawei March 2015
URNs for the Alert-Info Header Field of the Session Initiation Protocol (SIP)
The Session Initiation Protocol (SIP) supports the capability to provide a reference to a specific rendering to be used by the User Agent (UA) as an alerting signal (e.g., a ring tone or ringback tone) when the user is alerted. This is done using the Alert-Info header field. However, the reference (typically a URL) addresses only a specific network resource with specific rendering properties. There is currently no support for standard identifiers for describing the semantics of the alerting situation or the characteristics of the alerting signal, without being tied to a particular rendering. To overcome these limitations and support new applications, a new family of URNs for use in Alert-Info header fields (and situations with similar requirements) is defined in this specification.
This document normatively updates RFC 3261, which defines the Session Initiation Protocol (SIP). It changes the usage of the Alert-Info header field defined in RFC 3261 by additionally allowing its use in any non-100 provisional response to INVITE. This document also permits proxies to add or remove an Alert-Info header field and to add or remove Alert-Info header field values.
al. Standards Track [Page 1]
RFC 7462 Alert URNs March 2015
Status of This Memo
This is an Internet Standards Track document.
This document is a...