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## IMS and ETSI References

For more information about IMS and TISPAN, consult the following specifications:

- ETSI ES 283 026 V0.0.7 (2005-10) Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); Resource and Admission Control; Protocol for QoS reservation information exchange between the Service Policy Decision Function (SPDF) and the Access-Resource and Admission Control Function (A-RACF) in the Resource and Protocol specification.
- ETSI TS 183 017 V.0.0.8 (2005-10) Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); Resource and Admission Control: DIAMETER protocol for session based policy set-up information exchange between the Application Function (AF) and the Service Policy Decision Function (SPDF); Protocol specification.
- ETSI ES 283 034 V0.0.5 (2005-10) Telecommunications and Internet converged Services and Protocols for Advanced Networks (TISPAN); Network Attachment Sub-System (NASS); e4 interface based on the DIAMETER protocol.

## Abbreviations

Table 10 identifies abbreviations used in the IMS and ETSI-TISPAN environments.

Table 10: Abbreviations in the IMS and ETSI-TISPAN Environments

Abbreviation | Description
--- | ---
3GPP | 3rd Generation Partnership Project, which developed the IMS specifications.
A-RACF | Access-resource and admission control function. Provides admission control and network policy assembly.
AVP | Attribute value pair
BGF | Border gateway function
ETSI | European Telecommunications Standards Institute
FMC | Fixed mobile convergence
IMS | IP multimedia subsystem
NGN | Next-generation network
RACS | Resource and admission control subsystem. Consists of the A-RACF and the SPDF.
RCEF | Resource control enforcement function
SPDF | Service policy decision function. The SPDF coordinates the resource reservations requests that it receives from the application function.
TISPAN | Telecommunications and Internet Converged Services and Protocols for Advanced Networks

#### Related Topics

- Overview of an IMS Environment
- IMS Layers
- ETSI-TISPAN Architecture
- SRC Software in the ETSI-TISPAN Architecture
- Configuring the IMS Software (SRC CLI)

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