ITU-T Q.129

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INTERNATIONAL TELECOMMUNICATION UNION

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TELECOMMUNICATION

STANDARDIZATION SECTOR

OF ITU

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)454Recommendation1

(Extract from the "LUE"OOK)

NOTES

1 ITU-T Recommendation Q.129 was published in Fascicle VI.2 of the Blue Book. This file is an extract from

the Blue Book. While the presentation and layout of the text might be slightly different from the Blue Book version, the

contents of the file are identical to the Blue Book version and copyright conditions remain unchanged (see below).

2 In this Recommendation, the expression “Administration” is used for conciseness to indicate both a

telecommunication administration and a recognized operating agency.

 ITU 1988, 1993

mechanical, including photocopying and microfilm, without permission in writing from the ITU.

Fascicle VI.2 - Rec. Q.129 1

Recommendation Q.129

Fascicle VI.2 - Rec. Q.129

4.6 MAXIMUM DURATION OF A BLOCKING SIGNAL

When a blocking signal is sent on a circuit, an alarm should be given at the outgoing end of the circuit if the

blocking condition persists for more than about 5 minutes.

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摘要：

ITU-T Q.129 是国际电信联盟电信标准化部门制定的一项关键标准规范，主要定义了电话网中信令系统的协议架构与功能要求，为全球传统电话网络（PSTN）的互连互通提供了统一的技术基准。该文档聚焦于七号信令系统（SS7）的底层机制，详细规定了信令点编码、消息传递部分（MTP）的协议操作，以及呼叫建立、释放和补充业务的控制流程。对于通信工程师、网络规划者及电信行业合规团队而言，遵循ITU-T Q.129有助于确保跨运营商网络的信令兼容性、降低信令延迟，并防止因协议差异导致的呼叫失败或计费错误。理解

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ITU-T Q.129

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