YD/T 4530-2023 in English
VALIDbased distributed ENUM Technical requirements for Unified IMS(stage 2) system
- Issued on:2023-12-29
- Implemented on:2024-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$544.00
| Standard No: | YD/T 4530-2023 |
| Document status: | VALID |
| Title in English: | based distributed ENUM Technical requirements for Unified IMS(stage 2) system |
| Title in Chinese: | 基于统一IMS（第二阶段）的分布式电话号码映射（ENUM）系统技术要求 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2023-12-29 |
| Implemented on: | 2024-07-01 |
| Professional Classification: | YD-Telecommunication |
| Related Topics: | ims
number ims ims data ims number distributed Distributed+ Where is the signal peptide located? Standards related to the division of telephone code segments |
本文件规定了统一IMS（第二阶段）网络中分布式ENUM系统的的功能架构和接口信令要求，包括分布式ENUM系统组成、网元功能要求、接口功能要求及信令流程等。
本文件适用于统一IMS第二阶段（包括VoLTE IMS和固网IMS）的设计和研发。
Introduction
Technical Background and Evolution of Standards
As the IMS network evolves to the second phase, the traditional centralized ENUM system shows insufficient scalability in cross-operator interconnection scenarios. The distributed ENUM architecture proposed in this standard interconnects I-ENUM Server nodes to achieve efficient mapping between E.164 numbers and SIP URIs, and supports the deep integration of VoLTE and fixed-line IMS.
Core Architecture Analysis
| Components | Functions | Deployment Requirements |
|---|---|---|
| IES Node | Store cross-operator ENUM data and support NAPTR record translation | Requires configuration of primary and backup IP addresses and support for NTP time synchronization |
| Carrier-grade ENUM | Processes intra-domain queries and triggers cross-domain queries when failure occurs | Can be set up together with IES |
| Interface System | I1-I4 four types of interfaces for data synchronization and query | Requires support for HTTP/SOAP/DNS protocol stacks |
Key Function Implementation
5.2.1 Data Management Mechanism
IES adopts the broadcast synchronization mechanism to maintain data consistency across operators, supporting:
- Incremental synchronization: newly added number segments are broadcast through NODE_JOIN_REQ
- Real-time update: data modification triggers the MODDATA_BROCAST process
- Safe deletion: The DELDATA process ensures data integrity
5.2.4 Authentication Design
Adopt two-factor authentication: operator ID+IP whitelist binding, abnormal access trigger:
- Direct rejection if source IP verification fails
- Automatic switching of primary and backup IPs (heartbeat cycle 1-3min)
- Overload protection threshold defaults to CPU50%/memory70%
Typical application scenarios
Cross-IMS domain call flow
Case: A user of operator A calls a user of operator B
1. The calling S-CSCF initiates a recursive query through the I3 interface
2. IES returns the SIP URI of domain B
3. An end-to-end SIP session is established (see Figure 10 for the signaling process)
Implementation recommendations
Deployment considerations
- The IP and service identifier of the interconnected operator's IES node must be pre-configured
- A hierarchical topology is recommended to control broadcast storms
- The operation and maintenance interface must implement 4-level permission isolation
Operation and maintenance monitoring points
| Monitoring items | Indicators | Alarm method |
|---|---|---|
| Data synchronization delay | <500ms | SMS/email |
| Query success rate | >99.9% | Sound and light alarm |
| Interface load | Peak value<80% | Web interface |
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