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TS 03.78 (CT4)
Customised Applications for Mobile network Enhanced Logic (CAMEL) Phase 2 – Stage 2

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(P) GSM Rel-98 v7.8.1    2002/08    202 p.
(P) GSM Rel-97 v6.11.1    2002/08    201 p.
(P) GSM Rel-96 v5.8.0    1999/06    80 p.

Rapporteur:  LANTELME, Isabelle
Descendant(s):  TS 23.078    
See also:  CAMEL-related TS/TR    

This TS specifies the stage 2 description for the second phase (see TS 02.78) of the Customized Applications for Mobile network Enhanced Logic (CAMEL) feature which provides the mechanisms to support services of operators which are not covered by standardized GSM services even when roaming outside the HPLMN.

The CAMEL feature is a network feature and not a supplementary service. It is a tool to help the network operator to provide the subscribers with the operator specific services even when roaming outside the HPLMN.

In this TS, the GSM Service Control Function (gsmSCF) is treated as being part of the HPLMN. The regulatory environment in some countries may require the possibility that the gsmSCF and the HPLMN are controlled by different operators, and the gsmSCF and the HPLMN are therefore distinct entities.

In the second phase the CAMEL feature supports:
  • mobile originated and forwarded calls;
  • mobile terminating calls;
  • any time interrogation;
  • suppression of announcements;
  • announcements, in band user interaction;
  • charging features;
  • supplementary service invocation notifications;
  • USSD interaction with the gsmSCF.
  • North American carrier selection.


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1   Scope   PDF-p. 10
2   References   PDF-p. 11
3   Definitions, symbols and abbreviations   PDF-p. 12
4   Architecture   PDF-p. 14
5   Detection Points (DPs)   PDF-p. 16
6   Description of CAMEL Subscriber Data   PDF-p. 19
7   Description of CAMEL BCSMs   PDF-p. 21
8   Procedures for CAMEL   PDF-p. 32
8.1   Overall SDL architecture
8.2   Handling of mobile originated calls   PDF-p. 35
8.3   Retrieval of routeing information   PDF-p. 64
8.4   Handling of mobile terminating calls   PDF-p. 101
8.5   Handling of forwarded calls      Up
8.6   Handling of mobile calls in the gsmSSF   PDF-p. 116
8.7   Assisting case   PDF-p. 151
8.8   Procedure CAMEL_Provide_Subscriber_Info   PDF-p. 160
8.9   Any Time Interrogation   PDF-p. 162      Up
8.10   Handling of USSD to/from gsmSCF   PDF-p. 164
8.11   Handling of Supplementary Service Invocation Notification
8.12   CAMEL specific handling of location updating and data restoration
8.13   Processing of Non-Call Related Events
8.14   Cross phase compatibility   PDF-p. 166      Up
8.15   Handling of North American Carrier Information
9   Description of information flows   PDF-p. 167
9.1   gsmSSF to gsmSCF information flows
9.2   gsmSCF to gsmSSF information flows   PDF-p. 172
9.3   Optional (Service logic dependent) gsmSCF to gsmSRF information flows   PDF-p. 180
9.4   gsmSRF to gsmSCF information flows
9.5   gsmSCF to Assisting SSF information flows
9.6   Assisting SSF to gsmSCF information flows   PDF-p. 185
9.7   gsmSCF to HLR information flows
9.8   HLR to gsmSCF information flows
9.9   HLR to VLR information flows
9.10   VLR to HLR information flows
9.11   HLR to GMSC information flows
9.12   GMSC to HLR information flows   PDF-p. 193
9.13   MSC to gsmSCF information flows   PDF-p. 194
9.14   VMSC to GMSC information flows
9.15   MSC to VLR information flows   PDF-p. 195
9.16   VLR to MSC information flows
10   Interaction with supplementary services   PDF-p. 198
A   Change history   PDF-p. 200

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