CAMEL: Intelligent Networks for the GSM, GPRS and UMTS Network in VS .NET

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CAMEL: Intelligent Networks for the GSM, GPRS and UMTS Network
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Figure 58 O-BCSM for CAMEL phase 3 Reproduced from 3GPP TS 23078 v3190, gure 43, by permission of ETSI
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The subscribed dialled service uses CAP v3 (or CAP v4 in CAMEL Phase 4) If the subscribed dialled service is used in a call in combination with a subscribed service, then the subscribed service may use any CAP version That means that, within one MSC, O-CSI and D-CSI for a call may use different CAP versions In this way, an operator may introduce subscribed dialled services without having to upgrade the already operational subscribed service to CAMEL phase 3 5212 Contents of D-CSI D-CSI consists of a list of up to 10 numbers; each number has a CAMEL service associated with it Table 57 shows an example of D-CSI The CAMEL service that is invoked at DP analysed info depends on the dialled number This is different from the trigger criteria that are contained in O-CSI; although O-CSI may contain a set of 10 numbers, there is only one CAMEL service associated with O-CSI D-CSI contains one CAMEL capability handling parameter only That implies that all subscribed services contained in D-CSI use the same CAMEL phase If the operator wishes to use CAMEL phase 4 for a subscribed service, then all subscribed services contained in D-CSI will be upgraded
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CAMEL Phase 3
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-O-CSI -D-CSI - HLR
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Subscribed Subscribed dialled service service (O-CSI) (D-CSI)
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-F TN -O-CSI -D-CSI - HLR FTN; OCSI; DCSI;
Subscribed Subscribed dialled service service (O-CSI) (D-CSI)
SCP1
SCP2
SCP1
SCP2
O-CSI; DCSI;
MAP ISD
CAPv 3
CAPv 3
MAP SRI-Res
CAPv 3
CAPv 3
DTAP
MSC Mobile originated call
ISUP
ISUP
GMSC Mobile forwarded call
ISUP
Figure 59 Table 57
Subscribed dialled service for MO and for MT call
Example contents of D-CSI Number Service key 125 126 127 128 gsmSCF address +27 83 887766 +27 83 887766 +27 83 887767 +27 83 887767 Default call handling Continue Continue Release Release
1 2 3 4
0800 2143 0800 0900 8754 0900
CAMEL capability handling = CAMEL phase 3
to CAMEL phase 4 Alternatively, the operator de nes multiple D-CSIs: a CAMEL phase 3 D-CSI and a CAMEL phase 4 D-CSI However, the HLR may send not more than one D-CSI to VLR or GMSC for a subscriber When D-CSI is checked, the gsmSSF compares the dialled number with each number in D-CSI, until a match is found If overlap exists between two or more numbers in D-CSI, then this may affect the outcome of the D-CSI check and, as a result, a different service may be invoked The example D-CSI structure in Table 58 contains overlap between 0800 2143 and 0800 If the subscriber dials 0800 2144, then different dialled services could be invoked Compare the two practical cases in Table 58 The operator shall therefore place the numbers in D-CS in the correct order5
Table 58 Dialled number 0800 2143 0800 2143 D-CSI number check Sequence of checking 0800 2143 0800 0800 0800 2143 Result
entry 1 (SK125; +2783887766; continue) entry 2 (SK126; +2783887766; continue)
5 The order of the numbers in the trigger criteria for O-CSI is not relevant The reason is that O-CSI speci es a single IN service only for DP collected info
CAMEL: Intelligent Networks for the GSM, GPRS and UMTS Network
5213 Dialogue Capabilities for D-CSI A rule that CAMEL has inherited form ETSI CS1 is single point of control This rule entails that, for a single BCSM instance, at the most one IN service may be in control When the subscribed dialled service is invoked at DP analysed info, a subscribed service may already be active; this subscribed service was invoked at DP collected info To guarantee that at most one IN service is in control, the dialled service has a short dialogue The short dialogue has the following characteristics, compared with a long dialogue: (1) the short dialogue is not allowed to arm detection points; and (2) the short dialogue is not allowed to request reports The following CAP operations may therefore not be used by the dialled service: request report BCSM event (RRB), apply charging (ACH), call information request (CIRq) Pre-arranged end rules specify that, when the SCP gives control of a call back to the MSC/gsmSSF and there are no armed DPs or pending reports, the CAMEL relationship will be closed Hence, when the dialled service gives control of the call back to the MSC/gsmSSF, by sending CAP continue (CUE), CAP connect (CON) or CAP continue with argument (CWA), the dialled service will terminate The following capabilities remain available for the dialled service: (1) (2) (3) (4) (5) user interaction (connect to resource, establish temporary connection, play announcement, etc); charging (send charging information, furnish charging information); call gap; call termination (release call); call continuation, possibly with modi ed call information (continue, connect, continue with argument)
The dialled service may use CAP operations reset timer (RT) and activity test (AT) when required The CAP v3 application context for the dialled service is the same as the CAP v3 application context for the subscribed service The dialled service should therefore take care not to use capability that is not allowed for the dialled service, such as sending CAP ACH Owing to the fact that the subscribed dialled service can not arm any detection points, the abandon event from the calling party can not be noti ed to the subscribed dialled service Therefore, if the abandon event occurs during user interaction, then this leads to CAP dialogue abort (TC Abort) for the subscribed dialled service 5214 User Interaction The user interaction capability for the dialled service is the same as for the subscribed service While the subscribed service is waiting for call answer, the dialled service may apply user interaction (Figure 510) The dialled service in Figure 510 applies user interaction with through-connect The
Subscribed service (at DP2) SCP CAP v3 SCP CAP v3 Connect to resource [ bothway ThroughConnectionInd = TRUE] Subscribed dialled service (at DP3)