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Early Media and Ringing Tone Generation in the Session Initiation Protocol (SIP) (RFC3960)

IP.com Disclosure Number: IPCOM000033610D
Original Publication Date: 2004-Dec-01
Included in the Prior Art Database: 2004-Dec-18
Document File: 14 page(s) / 32K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

G. Camarillo: AUTHOR [+2]

Abstract

This document describes how to manage early media in the Session Initiation Protocol (SIP) using two models: the gateway model and the application server model. It also describes the inputs one needs to consider in defining local policies for ringing tone generation.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 9% of the total text.

Network Working Group                                       G. Camarillo

Request for Comments: 3960                                      Ericsson

Category: Informational                                   H. Schulzrinne

                                                     Columbia University

                                                           December 2004

                Early Media and Ringing Tone Generation

                in the Session Initiation Protocol (SIP)

Status of This Memo

   This memo provides information for the Internet community.  It does

   not specify an Internet standard of any kind.  Distribution of this

   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2004).

Abstract

   This document describes how to manage early media in the Session

   Initiation Protocol (SIP) using two models: the gateway model and the

   application server model.  It also describes the inputs one needs to

   consider in defining local policies for ringing tone generation.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2

   2.  Session Establishment in SIP . . . . . . . . . . . . . . . . .  3

   3.  The Gateway Model. . . . . . . . . . . . . . . . . . . . . . .  4

       3.1.  Forking. . . . . . . . . . . . . . . . . . . . . . . . .  4

       3.2.  Ringing Tone Generation. . . . . . . . . . . . . . . . .  5

       3.3.  Absence of an Early Media Indicator. . . . . . . . . . .  7

       3.4.  Applicability of the Gateway Model . . . . . . . . . . .  8

   4.  The Application Server Model . . . . . . . . . . . . . . . . .  8

       4.1.  In-Band Versus Out-of-Band Session Progress Information.  9

   5.  Alert-Info Header Field. . . . . . . . . . . . . . . . . . . .  9

   6.  Security Considerations. . . . . . . . . . . . . . . . . . . .  9

   7.  Acknowledgments. . . . . . . . . . . . . . . . . . . . . . . . 10

   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 11

       8.1.  Normative References . . . . . . . . . . . . . . . . . . 11

       8.2.  Informative References . . . . . . . . . . . . . . . . . 11

       Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 12

       Full Copyright Statement . . . . . . . . . . . . . . . . . . . 13

Camarillo & Schulzrinne      Informational                      [Page 1]

RFC 3960        Early Media and Ringing Tone Generation    December 2004

1.  Introduction

   Early media refers to media (e.g., audio and video) that is exchanged

   before a particular session is accepted by the called user.  Within a

   di...