ETSI - PRETS 300 392-11-4
Terrestrial Trunked Radio (TETRA); Voice Plus Data (V+D); Part 11: Supplementary Services Stage 2; Sub-Part 4: Call Forwarding
| Organization: | ETSI |
| Publication Date: | 1 September 1999 |
| Status: | inactive |
| Page Count: | 93 |
scope:
The present document specifies the Call Forwarding supplementary services:
- Call Forwarding Unconditional (SS-CFU);
- Call Forwarding Busy (SS-CFB);
- Call Forwarding No Reply (SS-CFNRy); and
- Call Forwarding Not Reachable (SS-CFNRc);
which are applicable to various basic services supported by TETRA SwMIs. Basic services are specified in EN 300 392-2 [4].
SS-CFU, SS-CFB, SS-CFNRy and SS-CFNRc are supplementary services which apply during call establishment providing a forwarding of an incoming call to an other destination than the original destination defined by the called (served) user under different conditions (busy, no reply or not reachable respectively) or under no condition (unconditional).
Supplementary service specifications are produced in three stages, according to the method described in ITU-T Recommendation 1.210 [2]. This Standard contains the stage 2 specifications of SS-CFU, SS-CFB, SS-CFNRy and SS-CFNRc. The stage 2 specification identifies the functional entities involved in the supplementary services and the information flows between them.
This draft ETS is applicable to circuit mode TETRA tele-services and bearer services only for all supplementary services specified in this draft ETS. This draft ETS applies also for SS-CFU to SDS (Short Data Services).
This Standard also specifies the Forwarding Counter (FC) applicable to various basic services supported by TETRA Network. FC limits the number of call forwarding that a call request may encounter during call establishment, e.g. to protect the network against indefinite looping. There is no user involved in the provision or operation of FC.
Man Machine Interfaces and charging principles are outside the scope of this draft ETS.
This first edition of this ETS is based on the latest published text of ECMA-173 [1]. Additions/changes to ECMA-173 [1] have been made to take into account particular TETRA specifics such as group calls and to include situations such as Not Reachable not addressed in ECMA-173 [1].
NOTE 1: Contrary to ECMA-173 [1], this ETS does not specify SS-CD (Call Deflection) which is not supported by TETRA.
NOTE 2: Contrary to ECMA-173 [1], this draft ETS distinguishes between No Reply and Not Reachable because of the radio nature of the TETRA links.
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