Essential IMS training course 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.
Who will benefit?
Telecommunications staff.
Essential IMS training course prerequisites
Mobile communications overview.
Essential IMS training course objectives
By the end of the course delegates will be able to:
- Describe the IMS.
- Describe the IMS architecture.
- Explain how charging, security and QoS is handled in the IMS.
- Explain how the IMS supports service enablers such as Push to talk and Presence.
Duration: 2 days
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Essential IMS training
course contents
Mobile communications review
The role of IP in telecommunications. GSM to IMS. Enhanced multimedia services, Push To, convergence, conferencing, roaming.
What is IMS?
What it is, why IMS, standard bodies: 3GPP, IETF, OMA, IMS services. MMD comparison.
IMS architecture blocks
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.
HSS – User database
Identification. The user database, role of HSS, SLF and multiple HSSs. “Normal” identities, IMPI, IMPU.
IMS signalling: SIP
What is SIP? SIP URI, contact address, UAs, Proxies, basic SIP call flow, SIP sessions.
IMS other protocols
Megaco, Diameter, XML, XCAP, COPS, RTP/RTCP, SDP, H.324M, IM and MSRP.
Call/Session Control
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.
IMS services
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).
Gateways
IMS PSTN procedures, BGCF, PSTN interface. SGW, MGCF, MGW.
Charging
Architecture, Offline, online and flow based charging, charging reference points, CCF, DIAMETER, ICID, IOI.
IMS security
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.
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