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ETSI EN 300 392-12-12
M00000931
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ETSI EN 300 392-12-12 Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 12: Supplementary services stage 3; Sub-part 12: Call Hold (HOLD)
standard by European Telecommunications Standards Institute, 05/01/2003
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Full Description
The present document specifies the stage 3 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 individual call and then subsequently, if desired,re-establish communication.
Man-Machine Interface (MMI) and charging principles are outside 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 1 description specifies the service from the user's point of view (seeETS 300 392-10-12 [7]). The stage 2 description identifies the functional capabilities and the information flows neededto support the service as specified in its stage 1 description (see EN 300 392-11-12 [8]). The present stage 3 descriptionspecifies the protocols at the air interface and at the various Inter-System Interfaces (ISI) to support SS-HOLD.
NOTE 1: According to ITU-T Recommendation I.130 [1], the stage 3 description of any telecommunication serviceaddresses the network implementation aspects. Consequently it comprises two steps: the specifications ofall protocols at the various reference points involved in any of the service procedures (notably the serviceoperation) are the first step of the stage 3 description, and the specifications of the functions of thecorresponding network entities are its second step.
NOTE 2: The latter have not been provided since they can be derived from the specification of the functional entityactions in the stage 2 description.The present document is applicable to Voice plus Data individual calls; more specifically to the following entities:the MS/LSs of the served user and of his distant party; andthe served user Switching and Management Infrastructure (SwMI) in an individual call.