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subscriber, based on the MSRN received from HLR The effect of applying BOR to a mobile terminating call is illustrated by the following example Calling party (A-party), who belongs to a UK-based operator, is roaming in France This A-party establishes a call to a B-party, who belongs to the same UK-based operator and who is also roaming in France at this moment Non-BOR Case The call from the A-party is destined for a UK subscriber (eg +44 20 xxx), so the VMSC in France routes this call to the UK Within the UK, the call is routed to the HPLMN of the destination subscriber A GMSC in that PLMN performs HLR interrogation and receives the MSRN for the call to the VMSC of the B-party B-party is currently in France, so the call is routed to the VMSC in France As a result, there are two international call legs: (1) the A-party has established an MO call from France to the UK; (2) the B-party has a roaming terminating call from the UK to France (Figure 479) BOR Case When the A-party establishes the call, the VMSC determines that the call is destined for a subscriber that belongs to a PLMN with which the VPLMN operator has a BOR agreement The BOR agreement entails that this PLMN is entitled to perform HLR interrogation in the other PLMN As a result, the VMSC of the A-party forwards the call to a GMSC in the same network This GMSC may be a designated node or may be co-located with the VMSC The GMSC derives the GT of the HLR from the B-party s MSISDN and then performs the HLR interrogation The HLR returns the MSRN for this call The GMSC may now route the call to the VMSC, using the MSRN As a result, there are two local call legs: (1) the A-party has established an MO call from a VMSC in the French network to a destination within that same network; (2) the B-party has a roaming terminating call within the French network (Figure 480) The GMSC in the IPLMN shall be con gured to know for which HPLMNs it is permitted to interrogate the HLR; the HLR in turn will be con gured to allow BOR for selected IPLMNs, besides its own PLMN The calling party in Figure 480 has effectively established a local call If the calling party is subject to on-line charging, then the CAMEL service will take care when BOR is used CAMEL phase 2 has no mechanism to provide the SCP with an explicit indication that BOR was successfully
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applied for the call The location of the called subscriber determines, amongst others, whether BOR is permissible for the call When the calling party in Figure 480 sets up the call to the UK-based destination, the SCP cannot know whether BOR will be applied for this call As a result, the service cannot know how to rate this call CAMEL phase 4 has improved interaction with BOR An SCP may determine whether BOR should be applied to the outgoing call CAMEL phase 4 enables the SCP to instruct the VMSC to initiate BOR 4811 Terminating Call Handling with BOR One aspect with BOR is the terminating call handling for the called subscriber The called party may have a terminating CAMEL subscription Hence, the HLR sends the T-CSI to the GMSC in the IPLMN The HLR veri es that the GMSC supports the required CAMEL phase before sending T-CSI If the terminating call is subject to on-line charging, then the on-line charging may be applied directly in the GMSC in the IPLMN However, if BOR results in a terminating call leg within the IPLMN (as in Figure 480), then the terminating call may be toll-free for the called party However, this may differ per operator If the terminating CAMEL service involves the use of announcements, then the HPLMN operator should ensure that the GMSC in the IPLMN has the required announcements installed The availability of appropriate announcements should be part of the BOR agreement between operators 4812 Call Forwarding with BOR The terminating call in combination with BOR may lead to early call forwarding, late call forwarding or ORLCF Operators may decide to prevent call forwarding in combination with BOR, since this may lead to uncommon call cases For example, if the call in Figure 480 leads to early call forwarding, then there will be a forwarding call leg from the GMSC to, for example, the voice mail box in the HPLMN of the called party The called party may be charged for this international call forwarding leg 482 Immediate Service Termination Immediate service termination (IST) is speci ed in GSM TS 0232 [7] and GSM TS 0335 [33] IST is a network feature that enables an operator to immediately terminate ongoing services from