Session Initiation Protocol (SIP), standardized by the Internet Engineering Task Force (IETF), has emulated the simplicity of the protocol architecture of hypertext transfer protocol (HTTP) and is being popularized for VoIP over the Internet because of the ease with which it can be meshed with web services. However, it is difficult to know exactly how many requests for comments (RFCs) have been published over the last two decades in regards to SIP or how those RFCs are interrelated.
Handbook on Session Initiation Protocol: Networked Multimedia Communications for IP Telephony solves that problem. It is the first book to put together all SIP-related RFCs, with their mandatory and optional texts, in a chronological and systematic way so that it can be used as a single super-SIP RFC with an almost one-to-one integrity from beginning to end, allowing you to see the big picture of SIP for the basic SIP functionalities. It is a book that network designers, software developers, product manufacturers, implementers, interoperability testers, professionals, professors, and researchers will find to be very useful.
The text of each RFC from the IETF has been reviewed by all members of a given working group made up of world-renowned experts, and a rough consensus made on which parts of the drafts need to be mandatory and optional, including whether an RFC needs to be Standards Track, Informational, or Experimental. Texts, ABNF syntaxes, figures, tables, and references are included in their original form. All RFCs, along with their authors, are provided as references. The book is organized into twenty chapters based on the major functionalities, features, and capabilities of SIP.
Table of Contents:
Networked Multimedia Services
Introduction
Functional Characteristics
Performance Characteristics
Summary
Problems
Basic Session Initiation Protocol
Introduction
Terminology
Multimedia Session
Session Initiation Protocol
SIP Request Messages
SIP Response Messages
SIP Call and Media Trapezoid Operation
SIP Header Fields
SIP Tags
SIP Option Tags
SIP Media Feature Tags
Summary
Problems
SIP Message Elements
Introduction
Canceling a Request
Registration
Indicating UA Capabilities
Discovering UA and Proxy Capabilities
Dialogs
Initiating a Session
Modifying an Existing Session
Handling Message Body
Terminating a Session
Proxy Behavior
Transactions
Transport
Summary
Problems
Addressing in SIP
Introduction
SIP Public Address
Globally Routable UA URI
Services URI
Summary
SIP Event Framework and Packages
Introduction
Event Framework
Event Package
Summary
Problems
Presence and Instant Messaging in SIP
Introduction
SIP Presence
SIP Instant Messaging
Summary
Problems
Media Transport Protocol and Media Negotiation
Introduction
Real-Time Transmission and Control Protocol
Secure RTP (SRTP)
ZRTP
Real-Time Streaming Protocol (RTSP)
Media Resource Control Protocol (MRCP)
Session Description Protocol (SDP)
Summary
Problems
DNS and ENUM in SIP
Introduction
Domain Name System
ENUM
DSN and ENUM Security
Summary
Problems
Routing in SIP
Introduction
SIP Registrar
SIP Proxy
Traversing a Strict-Routing Proxy
Rewriting Record-Route Header Field Values
Record-Routing with Globally Routable UA URI
Double Route-Record
Transport Parameter Usage Problems and Remedies
Caller Preferences-Based Routing
Location-Based Routing
Loop Detection
Summary
Problems
User and Network-Asserted Identity in SIP
Introduction
Multiple User Identities
Public User Identity
Private User Identity
Network-Asserted Identity
Summary
Problems
Early Media in SIP
Introduction
Early Media and Session Establishment in SIP
Early-Media Solution Models
Early-Media Solution Model with Disposition-Type: Early-Session
Early-Media Solution Model with P-Early-Media Header
Summary
Service and Served-User Identity in SIP
Introduction
Communications Service ID
Asserted- and Preferred-Service ID
Served-User ID for Handling Services
Summary
Problems
Connections Management and Overload Control in SIP
Introduction
Connections Management in SIP Network
Loss-Based Overload Control in SIP Network
Rate-Based Overload Control in SIP Network
Summary
Problems
Interworking Services in SIP
Introduction
SIP Session Border Controller
NAT Crossing by SIP
SIP–PSTN/ISDN Protocols Interworking
Summary
Problems
Resource Priority and Quality of Service in SIP
Introduction
Communications Resource Priority in SIP
Preemption Events in SIP
QOS in SIP
SDP Media Streams Mapping to QOS Flows
QOS Mechanism Selection in SDP
SIP Signaling Compression
Summary
Problems
Call Services in SIP
Introduction
Call Transfer and Related Call Services
Call Diversion Indication
Call Services Using Session Border Controller
Referring Call to Multiple Resources
Call Services with Content Indirection
Transcoding Call Services
INFO Method—Mid-Call Information Transfer
SIP Call Control UUI Transfer Services
Call Services Using DTMF
Emergency Call Services in SIP
Media Server Interfaces in SIP
Introduction
SIP Interface to VoiceXML Media Server
Summary
Problems
Multiparty Conferencing in SIP
Introduction
Multiparty Multimedia Conferencing
Third-Party Multiparty Conferencing
Summary
Problems
Security Mechanisms in SIP
Introduction
Multilevel Security Characteristics in SIP
Security Mechanisms Negotiation
Authentication in SIP
Authorization in SIP
Integrity and Confidentiality in SIP
Security for SIP URI-List Services
Consent-Based Communications for Enhancing Security in SIP
SIP Forking Proxy Security
Nonrepudiation Services in SIP
Call Flows Explaining SIP Security Features
Threat Model and Security Usage Recommendations in SIP
Summary
Problems
Privacy and Anonymity in SIP
Introduction
Privacy Mechanism in SIP
Asserted and Preferred Identity for Privacy in SIP
Connected Identity for Privacy in SIP
Guidelines for Using Privacy Mechanism in SIP
Anonymity in SIP
Summary
Problems
Appendix A: ABNF
Appendix B: Reference RFCs
About the Author :
Radhika Ranjan Roy is an electronics engineer, US Army Research, Development, and Engineering Command (RDECOM), Communications–Electronics Research, Development, and Engineering Center (CERDEC), Space and Terrestrial Communications Directorate (S&TCD) Laboratories, Aberdeen Proving Ground (APG), Maryland, since 2009. Before joining to US Army Research, he worked in various capacities in CACI, SAIC, AT&T/Bell Laboratories, CSC, and PDB since his graduation. He earned his PhD in electrical engineering with major in computer communications from the City University of New York, New York, in 1984, and MS in electrical engineering from the Northeastern University, Boston, Massachusetts, in 1978. He received his BS in electrical engineering from the Bangladesh University of Engineering and Technology, Dhaka, Bangladesh, in 1967. He has published more than 50 technical papers. He is holding and/or submitted over 30 patents. He authored a book titled Handbook of Mobile Ad Hoc Networks on Mobility Models in 2010.
