ETSI - PRETS 300 392-12-21
Radio Equipment and Systems (RES); Trans-European Trunked Radio (TETRA); Voice Plus Data (V+D); Part 12: Supplementary Services (SS) Stage 3; Part 12-21: Ambience Listening (AL)
| Organization: | ETSI |
| Publication Date: | 1 January 1996 |
| Status: | inactive |
| Page Count: | 41 |
scope:
This European Telecommunication Standard (ETS) defines the stage 3 specification of the Supplementary Service Ambience Listening (SS-AL) for the Trans-European Trunked Radio (TETRA) as provided by European operators. Stage 3 defines the signaling system protocols and switching functions needed to implement the service described in stage 1 and 2.
Charging principles and Man-Machine Interface (MMI) are outside the scope of this ETS.
The SS-AL enables a served user to place a TETRA Mobile Station (MS) or Line Station (LS) into a special type of voice call teleservice whereby the called MS (or LS) transmits without any action from, or indication to, the affected user. The teleservice may include a second listening party.
Document History