ETSI - EN 300 392-11-21
Terrestrial Trunked Radio (TETRA); Voice Plus Data (V+D); Part 11: Supplementary Services Stage 2; Sub-Part 21: Ambience listening (AL)
| Organization: | ETSI |
| Publication Date: | 1 February 2003 |
| Status: | inactive |
| Page Count: | 26 |
scope:
The present document defines the stage 2 specification of the Supplementary Service Ambience Listening (SS-AL) for the Terrestrial Trunked Radio (TETRA). Stage 2 identifies the functional entities involved in the supplementary service and the information flows between them. Aspects relating to all supplementary services are detailed in EN 300 392-9 [2].
NOTE: The stage 2 description is followed by the stage 3 description, which specifies the encoding rules for the information flows and process behaviour for the different entities in the SwMI and in the MS.
Charging principles and Man-Machine Interface (MMI) are outside the scope of the present document.
The SS-AL enables a 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 ambience listening call may include a second listening party.
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