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TS 03.18 (CT4)
Basic Call Handling

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(P) GSM Rel-98 v7.5.0    2003/12    192 p.
(P) GSM Rel-97 v6.8.0    2003/12    187 p.
(P) GSM Rel-96 v5.6.0    1998/09    169 p.

Rapporteur:  RUSSELL, Nick
Descendant(s):  TS 23.018    

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.


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1 Scope    2 References    3 Definitions and abbreviations    3.1 Definitions    3.2 Abbreviations    4 Architecture    4.1 Architecture for an MO call    4.2 Architecture for an MT call    5 Information flows    5.1 Information flow for an MO call    5.2 Information flow for retrieval of routeing information for an MT call    5.3 Information flow for an MT call    6 Principles for interactions with supplementary services    6.1 Call Deflection service (GSM 03.72)    6.2 Line identification services (GSM 03.81)    6.3 Call forwarding services (GSM 03.82)    6.4 Call wait (GSM 03.83)    6.5 Call hold (GSM 03.83)    6.6 Multiparty (GSM 03.84)    6.7 Closed user group (GSM 03.85)    6.8 Advice of charge (GSM 03.86)    6.9 User-to-user signalling (GSM 03.87)    6.10 Call barring (GSM 03.88)    6.11 Explicit Call Transfer (GSM 03.91)    6.12 Completion of Calls to Busy Subscriber (GSM 03.93)    7 Functional requirements of network entities    7.1 MO call    7.2 Retrieval of routeing information for MT call    7.3 MT call    8 Contents of messages    8.1 Messages on the B interface (MSC-VLR)    8.2 Messages on the C interface (MSC-HLR)    8.3 Messages on the D interface (VLR-HLR)    8.4 Messages on the F interface (MSC-EIR)    8.5 Messages on the MSC internal interface    8.6 Messages on the Gs interface    A Handling of an IAM at an MSC    B Change History   


1   Scope   PDF-p. 8
2   References
3   Definitions and abbreviations   PDF-p. 10
4   Architecture   PDF-p. 11
5   Information flows
6   Principles for interactions with supplementary services   PDF-p. 17
7   Functional requirements of network entities   PDF-p. 20
7.1   MO call
7.2   Retrieval of routeing information for MT call   PDF-p. 73
7.3   MT call   PDF-p. 124
8   Contents of messages   PDF-p. 168
8.1   Messages on the B interface (MSC-VLR)
8.2   Messages on the C interface (MSC-HLR)
8.3   Messages on the D interface (VLR-HLR)   PDF-p. 181
8.4   Messages on the F interface (MSC-EIR)
8.5   Messages on the MSC internal interface   PDF-p. 185
8.6   Messages on the Gs interface
A   Handling of an IAM at an MSC   PDF-p. 187
B   Change History   PDF-p. 190

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