IMS and SIP Signalling with NGN Access

Contents:

The IMS and SIP Signalling with NGN Access course explains the reason behind choosing IP for a bearer also for real-time multimedia services as Voice, Video and TV. It describes the Next Generation Network as standardised by the ETSI TISPAN work group. All nodes, interfaces and protocols in the NGN architecture are described. The course covers the protocols SIP, Diameter and H.248, as well as the aspects of Services, Security, Charging and QoS.

Pre-requisites:

General telecom and IP knowledge is recommended. For background knowledge, we recommend the Apis course TCP/IP in the Mobile World.

NGN Architecture Overview

• Reasons behind the introduction of NGN

• The telecom evolution

• Nodes, interfaces and protocols of NGN

• Introduction of NASS, RACS and PES

The Session Initiation Protocol - SIP

• VoIP basics

• User plane protocols: RTP and RTCP

• Basic SIP functionality, messages and headers

• The NAT problem

• SDP and the offer/answer model

The Network Attachment Subsystem - NASS

• Nodes interfaces and protocols

• Authentication and authorisation

• Configuration of the UE and the access network

The Resource and Admission Control Subsystem - RACS

• Nodes interfaces and protocols

• Admission control and resource reservation

The Diameter Protocol

• The Diameter base protocol

• Diameter usage on the NGN reference points

The PSTN/ISDN Emulation Subsystem - PES

• Nodes interfaces and protocols

• Interworking, introducing BICC, SIP-T and SIP-I

The H.248 Protocol

• The need for H.248

• Basic concepts, e.g. Terminations, Contexts, Descriptors, Properties, Commands, etc.

• An example: a PES call set-up using H.248

The IP Multimedia Subsystem – IMS

• How 3GPP and ETSI NGN uses SIP in IMS

• Introduction of the P-, I-, and S-CSCF nodes

• The Database function (USPF)

• The AS node and the Filter Criteria

• Identities, including ISIM, IMPI and IMPU

• SIP URI and tel URI usage

SIP extensions for IMS

• Methods and messages used in IMS to extend basic SIP; e.g. P-Headers, 100rel, path, precondition, compression, privacy, sec-agree and preferences

• DNS usage in SIP; SRV and NAPTR records

• ENUM usage

Traffic Case

• A deeper look at the messages sent in a simple IMS session initiation, including messages and parameters for the protocols SIP, Diameter and H.248.

Security

• The NGN security architecture, including the NASS authentication and the use of UMTS AKA

• IPsec ESP and IKE

• GAA and bootstrapping

Service Enablers

• The IMS Service Provisioning Architecture

• SIP usage in Presence, Conferencing, Messaging and Supplementary Services

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