"A Call Control and Multi-party usage framework for the Session Initiation Protocol (SIP)", Rohan Mahy, Robert Sparks, Jonathan Rosenberg, Dan Petrie, Alan Johnston, 5-Mar-09. ( bytes)

This document defines a framework and requirements for call control and multi-party usage of SIP. To enable discussion of multi-party features and applications we define an abstract call model for describing the media relationships required by many of these. The model and actions described here are specifically chosen to be independent of the SIP signaling and/or mixing approach chosen to actually setup the media relationships. In addition to its dialog manipulation aspect, this framework includes requirements for communicating related information and events such as conference and session state, and session history. This framework also describes other goals that embody the spirit of SIP applications as used on the Internet.

"A Framework for Session Initiation Protocol User Agent Profile Delivery", Sumanth Channabasappa, 13-Feb-08. ( bytes)

This document specifies a framework to enable configuration of Session Initiation Protocol (SIP) User Agents in SIP deployments. The framework provides a means to deliver profile data that User Agents need to be functional, automatically and with minimal or no User and Administrative intervention. The framework describes how SIP User Agents can discover sources, request profiles and receive notifications related to profile modifications. As part of this framework, a new SIP event package is defined for notification of profile changes. The framework provides minimal data retrieval options to ensure interoperability. The framework does not include specification of the profile data within its scope.

"A Framework for Application Interaction in the Session Initiation Protocol (SIP)", Jonathan Rosenberg, 20-Jul-05. ( bytes)

This document describes a framework for the interaction between users and Session Initiation Protocol (SIP) based applications. By interacting with applications, users can guide the way in which they operate. The focus of this framework is stimulus signaling, which allows a user agent to interact with an application without knowledge of the semantics of that application. Stimulus signaling can occur to a user interface running locally with the client, or to a remote user interface, through media streams. Stimulus signaling encompasses a wide range of mechanisms, ranging from clicking on hyperlinks, to pressing buttons, to traditional Dual Tone Multi Frequency (DTMF) input. In all cases, stimulus signaling is supported through the use of markup languages, which play a key role in this framework.

"IPv6 Transition in the Session Initiation Protocol (SIP)", Gonzalo Camarillo, 17-Aug-07. ( bytes)

This document describes how IPv4 Session Initiation Protocol (SIP) user agents can communicate with IPv6 SIP user agents (and vice versa) at the signaling layer as well as exchange media once the session has been successfully set up. Both single- and dual-stack (i.e., an IPv4-only and an IPv4/IPv6) user agents are considered.

"Registration Event Package Extension for Session Initiation Protocol (SIP) Globally Routable User Agent URIs (GRUUs)", Paul Kyzivat, 9-Jul-07. ( bytes)

RFC 3680 defines a Session Initiation Protocol (SIP)[5] event package for registration state. This package allows a watcher to learn about information stored by a SIP registrar, including its registered contact. However, the registered contact is frequently unreachable and thus not useful for watchers. The Globally Routable User Agent URI (GRUU), defined in RFC YYYY [3], is a URI that is capable of reaching a particular contact. However this URI is not included in the document format defined in RFC 3680. This specification defines an extension to the registration event package to include GRUUs assigned by the registrar.

"A User Agent Profile Data Set for Media Policy", Volker Hilt, Gonzalo Camarillo, Jonathan Rosenberg, 7-Mar-09. ( bytes)

This specification defines a document format for the media properties of Session Initiation Protocol (SIP) sessions. Examples for media properties are the codecs or media types used in a session. This document format is based on XML and extends the Schema for SIP User Agent Profile Data Sets. It can be used to describe the properties of a specific SIP session or to define policies that are then applied to different SIP sessions.

"RTCP-XR Summary", Alan Clark, Amy Pendleton, Alan Johnston, Henry Sinnreich, 5-Mar-09. ( bytes)

This document defines a SIP event package that enables the collection and reporting of metrics that measure the quality for Voice over Internet Protocol (VoIP) sessions.

"A Session Initiation Protocol (SIP) Event Package for Session-Specific Session Policies.", Volker Hilt, Gonzalo Camarillo, 12-Jul-08. ( bytes)

This specification defines a Session Initiation Protocol (SIP) event package for session-specific policies. This event package enables user agents to subscribe to session policies for a SIP session and to receive notifications if these policies change.

"Requirements from SIP (Session Initiation Protocol) Session Border Control Deployments", Jani Hautakorpi, Gonzalo Camarillo, Bob Penfield, Alan Hawrylyshen, Medhavi Bhatia, 5-Jan-09. ( bytes)

This document describes functions implemented in Session Initiation Protocol (SIP) intermediaries known as Session Border Controllers (SBCs). The goal of this document is to describe the commonly provided functions of SBCs. A special focus is given to those practices that are viewed to be in conflict with SIP architectural principles. This document also explores the underlying requirements of network operators that have led to the use of these functions and practices in order to identify protocol requirements and determine whether those requirements are satisfied by existing specifications or additional standards work is required.

"SIP (Session Initiation Protocol) Usage of the Offer/Answer Model", Takuya Sawada, Paul Kyzivat, 1-Jan-09. ( bytes)

The Session Initiation Protocol (SIP) utilizes the offer/answer model to establish and update multimedia sessions using the Session Description Protocol (SDP). The description of the offer/answer model in SIP is dispersed across multiple RFCs. This document summarizes all the current usages of the offer/answer model in SIP communication.

"Identification of Communications Services in the Session Initiation Protocol (SIP)", Jonathan Rosenberg, 4-Aug-08. ( bytes)

This document considers the problem of service identification in the Session Initiation Protocol (SIP). Service identification is the process of determining the user-level use case that is driving the signaling being utilized by the user agent. This document discusses the uses of service identification, and outlines several architectural principles behind the process. It identifies perils when service identification is not done properly - including fraud, interoperability failures and stifling of innovation.

"Updates to Asserted Identity in the Session Initiation Protocol (SIP)", John Elwell, 16-Jan-09. ( bytes)

SIP has a mechanism for conveying the asserted identity of the originator of a request by means of the P-Asserted-Identity header field. This header field is specified for use in requests using a number of SIP methods, in particular the INVITE method. However, RFC 3325 does not specify the insertion of this header field by a trusted UAC, does not specify the use of P-Asserted-Identity and P-Preferred- Identity header fields with certain SIP methods such as UPDATE, REGISTER, MESSAGE and PUBLISH, and does not specify how to handle an unexpected number of URIs or unexpected URI schemes in these header fields. This document extends RFC 3325 to cover these situations. This work is being discussed on the sipping@ietf.org mailing list.

"A Schema and Guidelines for Defining Session Initiation Protocol User Agent Profile Datasets", Martin Dolly, Dale Worley, 8-Mar-09. ( bytes)

This document defines the requirements and a format for SIP user agent profile data. An overall schema is specified for the definition of profile datasets. The schema also provides for expressing constraints for how multiple sources of profile data are to be combined. This document provides a guide to considerations, policies and syntax for defining datasets to be included in profile data.

"Design Considerations for Session Initiation Protocol (SIP) Overload Control", Volker Hilt, Eric Noel, Charles Shen, Ahmed Abdelal, 11-Jul-09. ( bytes)

Overload occurs in Session Initiation Protocol (SIP) networks when SIP servers have insufficient resources to handle all SIP messages they receive. Even though the SIP protocol provides a limited overload control mechanism through its 503 (Service Unavailable) response code, SIP servers are still vulnerable to overload. This document discusses models and design considerations for a SIP overload control mechanism.

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