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ETSI EN 300 392-11-12
M00000559
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ETSI EN 300 392-11-12 Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 11: Supplementary services stage 2; Sub-part 12: Call Hold (HOLD)
standard by European Telecommunications Standards Institute, 05/01/2005
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Full Description
The present document specifies the stage 2 description of the Supplementary Service Call Hold (SS-HOLD) for theTerrestrial Trunked Radio (TETRA).SS-HOLD enables a user to interrupt communication on an existing call and then subsequently, if desired, re-establishcommunication.
Man-Machine Interface (MMI) and charging principles are outside of the scope of the present document.
Supplementary service specifications are produced in three stages according to the method defined inITU-T Recommendation I.130 [1]. The stage 2 description identifies the functional capabilities and the informationflows needed to support the supplementary service as specified in its stage 1 description (see EN 300 392-10-12 [7]).The stage 2 description is followed by the stage 3 description, which specifies the protocols at the air interface and atthe various Inter-System Interfaces (ISI) to support the service.
The present document is applicable to TETRA Voice plus Data terminal equipment and networks.