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- 3GPP
- 3GPP gateway
- charging rule
- charging rule installation
- charging rule removal
- charging rule report
- Charging-Rule-Base-Name
- Charging-Rule-Install
- Charging-Rule-Name
- configuration statements
- configuration summary
- directory-connection
- directory-eventing
- file logging
- grouped configurations
- Gx interface
- initial properties
- Juniper-Substitution
- Juniper-Substitution-Name
- Juniper-Substitution-Value
- local properties
- managing
- NIC proxies
- NIC proxy
- non-parameterized charging rule
- object adapter Internet address
- overview
- parameterized charging rule
- PCRF
- peer communication
- restarting
- SAE
- service accounting
- service activation sequence
- service deactivation sequence
- service modification sequence
- session termination sequence
- starting
- stopping
- subscriber login sequence
- subscriber logout sequence
- subscriber type
- system logging
- 3GPP Gy
- configuration statements
- configuration summary
- directory-connection
- directory-eventing
- file logging
- grouped configurations
- initial properties
- interface
- local properties
- managing
- NIC proxies
- NIC proxy
- object adapter Internet address
- overview
- peer communication
- restarting
- service activation sequence
- service deactivation sequence
- starting
- stopping
- subscriber login sequence
- subscriber logout sequence
- subscriber type
- system logging
- 3GPP Gy NIC proxies
A
- Application Services Gateway. See Web Services Gateway
- arguments for scripts and methods
- ASG (Application Services Gateway). See Web Services Gateway
B
- B2B environments
- business partner responsibilities
- business partners
- business-to-business environments
C
- classify-traffic condition
- expanded classifiers
- clients
- configuration namespace
- conventions
- customer support 1
D
- Diameter
- documentation
- dynamic properties
- Dynamic Service Activator
- access constraints
- access to attributes
- access to methods
- access to methods and scripts
- access to scripts
- access to service sessions
- API
- attributes
- configuring with C-Web interface
- configuring with SRC CLI
- gateway extension
- general properties
- groups
- interacting with Web application server 1, 2
- loading
- logging properties
- configuring, C-Web interface 1, 2
- configuring, SRC CLI
- methods 1
- monitoring with SRC CLI
- NIC proxies, monitoring
- NIC proxies, viewing
- overview
- properties for clients and scripts
- redundancy
- sample data 1, 2
- scripts
- service sessions
- session handles
- SOAP operations, monitoring
- SOAP operations, viewing
- starting with C-Web interface
- starting with SRC CLI
- statistics, viewing
- subscriber types
- test environment
- configuring, SRC CLI 1, 2
- PCMM services
- testing 1
E
G
- gateway
- gateway extension
I
- IMS service sessions
- configuring
- test environment
- testing 1, 2
L
M
- managing
- SAE via external applications 1, 2
- services via external application
- manuals
- methods
N
- namespace, configuration
- NIC (network information collector)
- Dynamic Service Activator and
- testing
- test data 1, 2
- test data, 3GPP Gy
- NIC proxies
- notice icons
O
- operation
P
R
S
- SAE (service activation engine)
- configuring 3GPP gateway as external plug-in
- configuring 3GPP Gy as external plug-in
- configuring IMS as external plug-in
- managing via external applications 1, 2
- scripts
- services
- sessions
- service
- SOAP
- SRC owners 1
- SRC SOAP Gateway. See Web Services Gateway
- static properties
- support, technical See technical support
T
- technical support
- text conventions defined
W
- Web application gateway client
- Web application server 1
- Web applications
- Web Services Description Language. See WSDL
- Web Services Gateway 1
- clients 1
- Web application
- wholesaler-retailer environments
- WSDL files
IMS Layers
The IMS specifications define functions to handle the signaling and subscriber traffic for multimedia applications. The functions are separated into logical layers, and many of the specified functions often reside in a single platform. Vendors have the flexibility to implement IMS functions in consolidated ways, and it is natural that platforms such as softswitches will combine many logically separate IMS call-processing functions, and that routers will take on some of the session-enforcement and gateway functionality in IMS.
The three layers are the service layer, the control layer, and the connectivity layer. Figure 4 shows a high-level view of the IMS architecture.
Figure 4: High-Level View of the IMS Architecture
- Service layer—Hosts application and content services, including application servers and Web servers. It also includes generic service enablers that manage service elements such as user groups and presence. These service elements connect to subscribers through the control plane. The application layer supports most of the multimedia applications or application enablers, such as presence and location of the subscriber.
- Control layer—Makes the policy decisions that are enforced in the connectivity layer. This layer provides session control and management, and is responsible for setting up and taking down packet sessions. It also contains information about subscriber authentication, service authorization, and location.
- Connectivity layer—Supports the core network architecture of the General Packet Radio Service (GPRS), which consists of support nodes for data services. This layer is where routers, switches, firewalls, and optical transport reside, along with gateways that translate protocols between packet- and circuit-based traffic.
Signaling Protocol
Session Initiation Protocol (SIP) is the main signaling protocol in IMS. SIP is the proposed standard for multimedia communication between subscribers interacting with voice, video, and instant messaging. In IMS, the use of SIP facilitates interconnectivity between fixed and mobile networks.
Related Documentation
- IMS Environment Overview
- IMS and ETSI References
- SRC Software in the IMS Environment
- Configuring the IMS Software (SRC CLI)
