Terminating AoC Service interaction Late call forwarding in VS .NET

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the VT-CSI has no control over the call routing Practically, the control for the VT-CSI relates to interaction that requires a direct link with the VMSC Pre-paid for terminating call leg may be done with VT-CSI instead of T-CSI If pre-paid charging is done purely for the roaming leg between GMSC and VMSC, then using VT-CSI prevents the invocation of an MT call CAMEL service in the case of early call forwarding; the VT call CAMEL service is invoked only when an actual call leg is established with the VMSC If late call forwarding occurs, then the VT call CAMEL service is noti ed through the forwarding noti cation mechanism The forwarding noti cation mechanism in VMSC works identically to the forwarding noti cation mechanism in GMSC: before GSM call forwarding is performed, the VT call CAMEL service is noti ed, so that it can stop the charging In the example in Figure 513, two CAMEL services are indicated These services may act on the call at the same time However, an operator may have the following implementation: when the called subscriber is in the HPLMN, terminating calls will be subject to a VT CAMEL service from the VMSC; when the called subscriber is in the VPLMN, terminating calls will be subject to a MT CAMEL service from the GMSC The above mechanism requires the following setting in the HLR: VT-CSI send to VMSC in HPLMN, but not to VMSC in VPLMN; T-CSI send to GMSC when the called subscriber is in VPLMN, but not when the called subscriber is in HPLMN Although the capability to con gure the HLR as described above is not de ned in CAMEL, this capability is commonly available in HLRs A rationale for the above mechanism may be that an operator may have CAMEL phase 3 capability in the HPLMN and hence can use VT-CSI When the subscriber is roaming, she may register in a CAMEL phase 2 MSC and, in that case, terminating call handling is done in GMSC in HPLMN 5231 Charging The CRN and GMSC address (GMSCA) that are reported to the SCP are the CRN and GMSCA from the GMSC where the terminating call handling is performed CRN and GMSC are transported via MAP from GMSC to HLR (in MAP SRI) and from HLR to VLR (in MAP PRN); Figure 514 The combination of CRN and GMSCA may be used to correlate the CDRs that may be created for the terminating call The GMSCA may provide an indication of the location of the GMSC and hence may be used to determine the charge for the roaming leg
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VT-CSI service CDR [R] IDP [R] CAP v3 MAP PRN [R] MAP SRI [R] CAP v2 SCP HLR T-CSI service SCP CDR [R] IDP [R]
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R = Call reference number + (G)MSC address
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gsmSSF MS DTAP CDR [R] VMSC VT-CSI ISUP [MSRN]
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The location information that is reported to the SCP in CAP IDP for the VT-CSI service is still the stored location information for the called subscriber The reason is that CAP IDP is sent to the SCP before alerting of the called party takes place The location information in the VLR is updated after paging response 5232 Late Call Forwarding When late call forwarding occurs in the VMSC, the VT-CSI CAMEL service will receive a forwarding noti cation If the SCP responds with CAP CUE, then the forwarding continues The forwarding may be subject to ORLCF In that case, the roaming leg between GMSC and VMSC is released The VT-CSI CAMEL service is also released The SCP may induce late call forwarding in the VMSC by sending CAP CON to the gsmSSF in the VMSC This SCP-induced late call forwarding may not be subject to ORLCF The reason is that the forwarding reason in MAP RCH cannot indicate that the forwarding is caused by the SCP 524 CAMEL Service Invocation at Call Failure CAMEL phase 3 de nes additional TDPs for the O-BCSM and T-BCSM Table 511 lists the available TDPs for CAMEL phases 1 3 The DPs route select failure, T Busy and T No Answer relate to call establishment failure When the O-BCSM or T-BCSM makes a state transition to one of these DPs, a CAMEL service may be invoked These DPs may be used as event detection points within an already active CAMEL service However, by using them as trigger detection points, the invocation of a CAMEL service may be restricted to call establishment failure cases In cases where the CAMEL service needs to act only in these failure cases, arming route select failure, T Busy and T No Answer as TDP may prevent unnecessary CAMEL service invocation; the service is invoked only when necessary Once the service is invoked, the SCP may generate a follow-on call The O-CSI for one subscriber may contain both TDP Collected Info and TDP route select failure Although route select failure (and T Busy and T No Answer) may be armed as TDP, possible EDP arming for these DPs takes precedence This implies that no CAMEL service triggering will take place if a CAMEL service is active already The precedence rules are: IF CAMEL service is active THEN report DP as EDP, if dynamically armed ELSE report DP as TDP, if statically armed and trigger conditions are ful lled
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Table 511 Overview of TDPs in CAMEL phases 1 3 CAMEL phase Phase 1 O-BCSM Collected information Analysed info Route select failure T-BCSM Terminating attempt authorized T Busy T No Answer Phase 2 Phase 3
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