6 Principles for interactions with supplementary services

03.183GPPBasic call handlingRelease 1998TS

This clause specifies the principles used to describe the invocation of the GSM supplementary services which were standardised when this specification was drafted. Registration, erasure, activation, deactivation and interrogation are call-independent operations; they are therefore outside the scope of this specification. Descriptions may be found in the stage 2 specifications for each supplementary service.

In the modelling used in this specification, each supplementary service which a network entity supports is managed by a supplementary service handler, which handles data in the entity in which it runs. The call handling processes defined in this specification use the data to define the contents of messages to other entities. The basic call handling processes defined in this specification interact with the supplementary service handlers as shown in the SDL diagrams and the supporting text. If a network entity does not support a supplementary service, it bypasses the interaction with the handler for that supplementary service. Exceptions to this general principle are described later in this clause.

6.1 Call Deflection service (GSM 03.72)

The basic call handling processes ICH_MSC and ICH_VLR interact with the CD supplementary service (GSM 03.72) as described in subclauses 7.3.1 and 7.3.2 respectively.

6.2 Line identification services (GSM 03.81)

6.2.1 Calling Line Identification Presentation (CLIP)

The basic call handling processes ICH_VLR and ICH_MSC interact with the processes CLIP_MAF001 and CLIP_MAF002 (GSM 03.81 [11]) as described in subclauses 7.3.2 and 7.3.1.

6.2.2 Calling Line Identification Restriction (CLIR)

The basic call handling processes OCH_MSC and OCH_VLR interact with the processes CLIR_MAF004 and CLIR_MAF003 (GSM 03.81 [11]) as described in subclauses 7.1.1 and 7.1.2.

6.2.3 Connected Line Identification Presentation (COLP)

The basic call handling processes OCH_MSC and OCH_VLR interact with the processes COLP_MAF006 and COLP_MAF005 (GSM 03.81 [11]) as described in subclauses 7.1.1 and 7.1.2.

The basic call handling processes MT_GMSC and ICH_MSC interact with the process COLP_MAF039 [11] as described in subclauses 7.2.1 and 7.3.1.

6.2.4 Connected Line Identification Restriction (COLR)

The basic call handling processes ICH_VLR and ICH_MSC interact with the processes COLR_MAF040 and COLR_MAF041 (GSM 03.81 [11]) as described in subclauses 7.3.2 and 7.3.1.

6.3 Call forwarding services (GSM 03.82)

6.3.1 Call Forwarding Unconditional (CFU)

The basic call handling process SRI_HLR interacts with the process MAF007(GSM 03.82 [12]) as described in subclause 7.2.2

6.3.2 Call Forwarding on mobile subscriber Busy (CFB)

The basic call handling process ICH_VLR interacts with the process MAF008 (GSM 03.82 [12]) as described in subclause 7.3.2

6.3.3 Call Forwarding on No Reply (CFNRy)

The basic call handling process ICH_VLR interacts with the process MAF009 (GSM 03.82 [12]) as described in subclause 7.3.2

6.3.4 Call Forwarding on mobile subscriber Not Reachable (CFNRc)

The basic call handling processes SRI_HLR and ICH_VLR interact with the process MAF010 (GSM 03.82 [12]) as described in subclauses 7.2.2 and 7.3.2.

6.4 Call wait (GSM 03.83)

The basic call handling process ICH_VLR interacts with the process MAF013(GSM 03.83 [13]) as described in subclause 7.3.2. Further details of the handling of call waiting are given in subclauses 7.3.1 and 7.3.2.

6.5 Call hold (GSM 03.83)

Invocation of call hold before a basic call has been established will be rejected.

6.6 Multiparty (GSM 03.84)

Invocation of multiparty before a basic call has been established will be rejected.

6.7 Closed user group (GSM 03.85)

The basic call handling process OCH_VLR interacts with the process CUG_MAF014 (GSM 03.85 [15]) as described in subclause 7.1.2.

The basic call handling process SRI_HLR interacts with the process CUG_MAF015 (GSM 03.85 [15]) as described in subclause 7.2.2.

The interactions between call forwarding and CUG (GSM 03.85 [15]) are handled as described in subclause 7.2.2.6.

6.8 Advice of charge (GSM 03.86)

The interactions between Advice of Charge (GSM 03.86 [16]) and MO calls are handled as described in subclauses 7.1.1 and 7.1.2.

The interactions between Advice of Charge (GSM 03.86 [16]) and MT calls are handled as described in subclauses 7.3.1 and 7.3.2.

6.9 User-to-user signalling (GSM 03.87)

The basic call handling processes OCH_MSC, OCH_VLR, MT_GMSC and ICH_MSC interact with the UUS supplementary service as described in subclauses 7.1.1, 7.1.2, 7.2.1 and 7.3.1 respectively.

6.10 Call barring (GSM 03.88)

6.10.1 Barring of outgoing calls

The basic call handling process OCH_VLR interacts with the processes MAF017, MAF018 and MAF020 (GSM 03.88 [18]) as described in subclause 7.1.2.

6.10.2 Barring of incoming calls

The basic call handling process SRI_HLR interacts with the processes MAF022 and MAF023 (GSM 03.88 [18]) as described in subclause 7.2.2.

6.11 Explicit Call Transfer (GSM 03.91)

There is no interaction between Explicit Call Transfer and the basic call handling described in this specification.

6.12 Completion of Calls to Busy Subscriber (GSM 03.93)

The basic call handling processes OCH_MSC, OCH_VLR, MT_GMSC, SRI_HLR, PRN_VLR, ICH_MSC and ICH_VLR interact with the CCBS supplementary service as described in subclauses 7.1.1, 7.1.2, 7.2.1, 7.2.2, 7.2.3, 7.3.1 and 7.3.2 respectively.