This TS specifies the technical realisation of the handling of calls originated by a GSM mobile subscriber and calls directed to a GSM mobile subscriber, up to the point where the call is established. Normal release of the call after establishment is also specified.
The handling of DTMF signalling and Off-Air Call set-up (OACSU) are not described in this TS.
The details of the effects of GSM supplementary services on the handling of a call are described in the relevant TS 03.7x, TS 03.8x and TS 03.9x series of specifications.
The specification of the handling of a request from the HLR for subscriber information is not part of basic call handling, but is required for both CAMEL (TS 03.78
) and optimal routeing (TS 03.79
). The use of the Provide Subscriber Information message flow is shown in TS 03.78 and TS 03.79.
The specification of the handling of data calls re-routed to a SIWFS is described in TS 03.54
The logical separation of the MSC and VLR (shown in clauses 4, 5 and 7), and the messages transferred between them (described in clause 8) are the basis of a model used to define the externally visible behaviour of the MSC/VLR, which is a single physical entity. They do not impose any requirement except the definition of the externally visible behaviour.
If there is any conflict between this TS and the corresponding stage 3 specifications (TS 04.08
, TS 08.08
and TS 09.02
), the stage 3 specification shall prevail.