ETSI TS 101 441

The present document specifies the stage 2 description for the second phase (see 3GPP TS 02.78 [2]) of the CustomizedApplications for Mobile network Enhanced Logic (CAMEL) feature which provides the mechanisms to supportservices 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 toprovide the subscribers with the operator specific services even when roaming outside the HPLMN.

In this specification, the GSM Service Control Function (gsmSCF) is treated as being part of the HPLMN. Theregulatory environment in some countries may require the possibility that the gsmSCF and the HPLMN are controlledby 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.

Note that CAMEL is not applicable to Emergency Setup (TS 12), i.e., in case an Emergency call has been requested thegsmSSF shall not be invoked.

The mechanism described in the present document addresses especially the need for information exchange between theVPLMN or IPLMN and the HPLMN for support of operator specific services. Any user procedures for the control ofoperator specific services are outside the scope of the present document. Subscribers who have subscribed to operatorspecific services and therefore need the functional support of the CAMEL feature shall be marked in the HPLMN andVPLMN. In case a subscriber is marked to need CAMEL support, the appropriate procedures which provide thenecessary information to the VPLMN or the HPLMN are invoked. It is possible for the HPLMN to instruct the VPLMNor IPLMN to interact with a gsmSCF which is controlled by the HPLMN.

The specification of operator specific services is outside the scope of the present document.

Edition:

7.8.1

Published:

08/01/2002

File Size:

1 file , 1000 KB