Charging and Accounting in Visual Studio .NET

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Charging and Accounting
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GMSC Roaming call composite CDR Terminating CAMEL call attempt
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Changed parameters this parameter indicates which parameters were changed by the CAMEL service, with CAP connect or CAP continue with argument The CDR de nition allows indicating that the CgPN has been modi ed, but the CAMEL protocol does not allow for modifying the CgPN Furthermore, multiple Generic Number (GN) modi cations may be indicated in the CDR, while CAMEL allows only for modifying GN 6 (additional CgPN) These capabilities may be considered as forward-compatible functionality for possible extension of the CAMEL protocol When a CAMEL service changes the redirection information, the CDR re ects this by indicating only the call forwarding counter that was contained in the redirection information This is unfortunate Other parameters in redirection information that were (necessarily) provided by CAMEL are not re ected in the CDR Examples include redirecting indicator and redirecting reason 723 Composite CDRs For certain call cases, multiple CDRs may be produced by one network entity One example is the MT call in GMSC, for which roaming call attempt CDR and terminating CAMEL call attempt CDR may be produced In addition, in some vendors MSCs, the charging data for an MO CAMEL call is split into two or more CDRs: one CDR for call-related data, and another CDR for CAMEL service related data The serving MSC may combine these CDRs into a composite CDR See Figure 72 for the creation of composite CDRs for a terminating call The generation of a composite CDR, as opposed to the generation of two single CDRs, alleviates the billing system from having to correlate the two CDRs The generation of composite CDRs is not speci ed in the 3GPP charging speci cations (eg 3GPP TS 32250 [120]), but is a commonly applied method
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73 Transfer Account Procedure Files
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The TAP le is a le format that is used for the transfer of call data between operators The purpose of the transfer of the TAP les is, as the name implies, accounting between operators The TAP le format is de ned by the GSM Association (wwwgsmorg) TAP is de ned in the following permanent reference documents (PRDs):3 PRD TD32 [161]; Rejects and returns process ;4 PRD TD57 [162]; Transferred account procedure data record format speci cation, version 3; PRD TD58 [163]; TAP 3 implementation handbook ; PRD TD60 [164]; General scenarios for the transferred account procedure for data record format speci cation, version 3
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PRD is the document naming convention of the GSM Association The acronym TD in the le name refers to TADIG , which is the GSM Association s transferred account data interchange group
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MO basic call information M
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Equipment information C
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Basic service used M R
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CAMEL service used C
Value added service used
Dual service requested C
Operator specific information O R
Mobile station classmark C
Equipment Identifier OC
Dual O teleservice code M
Dual bearer service code M
IMEI M M
TAP le structure for MO call Reproduced from PRD TD57 v3101, Figure 36 by permission of GSM Association
Charging and Accounting
TAP le format is mainly speci ed in PRD TD57 [162] The TAP le format resembles the CDR format That is to say, many of the data elds from the CDR have an equivalent data eld in the TAP le There is, however, no formal mapping between CDR and TAP Whereas CDRs that are generated in a PLMN may differ per vendor or operator, the TAP les that are exchanged between operators will conform to the format speci ed in PRD TD57 [162] Figures 73 and 74 show the structure of a TAP le for an MO call The CAMEL information for the call is included in the element CAMEL service used Most of the elements in CAMEL service used are copied from the MOC CDR, such as gsmSCF Address (CAMEL server address), service key, reference number, etc Figure 75 re ects how CDRs that are generated by an MSC in a VPLMN are transferred to a Billing System in the HPLMN of the served subscriber The billing system may consist of various functional entities and nodes and varies per vendor and operator The billing system may not forward all CDRs to the CDR formatter, for conversion to TAP le Conversion to TAP may be needed only for call data that needs to be sent to another operator Within an operator s own network, other call detail formats than TAP may be used Support for CAMEL is introduced in TAP version 2; support for CAMEL phase 2 is available in TAP version 3 As from TAP version 3 onwards, ASN1 is used to de ne the TAP le format The ASN1 de nition of the various data elds includes extension markers [the three dots ( ) in the data element de nition; also referred to as ellipsis ] The extension marker allows the data element de nition to be extended when new data elds are added to the CDR that need to be copied to the TAP le Figure 76 shows an example data structure for a TAP le that is used to convey data related to an MO call