Essential IMS

Description

The IP Multimedia Core Network Subsystem (IMS) is defined by 3GPP as a new mobile infrastructure. This course studies the discreet elements in the IMS.

What will you learn

Essential IMS training course details

Telecommunications staff.

Mobile communications overview

2 days

The role of IP in telecommunications. GSM to IMS. Enhanced multimedia services, Push To, convergence, conferencing, roaming.

What it is, why IMS, standard bodies: 3GPP, IETF, OMA, IMS services. MMD comparison.

Overview, IMS functions, IMS interfaces, IMS protocols, IMS elements, IMS reference points. Access network, IMS in GSM, CDMA, WiFi & PSTN networks. Core network. Application, Control and Call planes.

Identification. The user database, role of HSS, SLF and multiple HSSs. 'Normal' identities, IMPI, IMPU.

What is SIP? SIP URI, contact address, UAs, Proxies, basic SIP call flow, SIP sessions.

Megaco, Diameter, XML, XCAP, COPS, RTP/RTCP, SDP, H.324M, IM and MSRP.

Call Session Control Functions (CSCF). Domains. Home networks, visited networks. CSCF and SIP. P-CSCF, P-CSCF discovery, P-CSCF functions. I-CSCF, DNS and I-CSCF. S-CSCF, S-CSCF functions, ENUM lookups. QoS. Example call flows.

Open service platform, Application Servers, profiles, AS interface with S-CSCF. 'Normal' services (Caller ID, Call waiting, transfer…) Push to talk Over Cellular (PoC), IMS conferencing, Group management, IMS Presence, IMS Messaging. Other possible applications. Media servers. (MRFC, MRFP).

IMS PSTN procedures, BGCF, PSTN interface. SGW, MGCF, MGW

Architecture, Offline, online and flow based charging, charging reference points, CCF, DIAMETER, ICID, IOI.

IMS security architecture, identities, AAA, public and private user ID, service filters, Cx interface, RADIUS, Diameter protocol, 3GPP AKA, integrity, privacy, NDS, IPSEC, trust, assertion.