DS/EN 300392-12-21 V1.3.1-2007

Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 12: Supplementary services stage 3; Sub-part 21: Ambience Listening (AL)

DS/EN 300392-12-21 V1.3.1-2007 发布历史

The present document defines the stage 3 specification of the Supplementary Service Ambience Listening (SS-AL) for the Terrestrial Trunked Radio (TETRA). Stage 3 defines the signalling system protocols and switching functions needed to implement the service described in stage 1 and stage 2. Charging principles and Man-Machine Interface (MMI) are outside the scope of the present document. The SS-AL enables the served user to place a TETRA Mobile Station (MS) into a special type of voice call whereby the called MS transmits without any action from, or indication to, the affected user. The SS-AL call can include a second listening party. The affected user can

DS/EN 300392-12-21 V1.3.1-2007由丹麦标准化协会 DK-DS 发布于 2007-08-21，并于 2007-08-21 实施。

DS/EN 300392-12-21 V1.3.1-2007在国际标准分类中归属于: 33.020 电信综合。

DS/EN 300392-12-21 V1.3.1-2007的历代版本如下：

• 2007年08月21日 DS/EN 300392-12-21 V1.3.1-2007

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标准号

DS/EN 300392-12-21 V1.3.1-2007

发布日期

2007年08月21日

实施日期

2007年08月21日

废止日期

无

国际标准分类号

33.020

发布单位

DK-DS

被代替标准

DS/EN 300392-12-21 V1.2.1- 2004

适用范围

The present document defines the stage 3 specification of the Supplementary Service Ambience Listening (SS-AL) for the Terrestrial Trunked Radio (TETRA). Stage 3 defines the signalling system protocols and switching functions needed to implement the service described in stage 1 and stage 2. Charging principles and Man-Machine Interface (MMI) are outside the scope of the present document. The SS-AL enables the served user to place a TETRA Mobile Station (MS) into a special type of voice call whereby the called MS transmits without any action from, or indication to, the affected user. The SS-AL call can include a second listening party. The affected user can