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Reply To: CAMEL


Hello Vijay,
T-CSI and O-CSI are CAMEL triggers for terminating and originating calls respectively.

When MS gets into the roaming area and MAP ( Update Location ) request will be sent from VLR to HLR, the HLR other then MS info also updates VLR with O_CSI triggers.

Where as in case of terminating cals, the GMSC will be updated with the T_CSI embedded in Routing Info_ACK message.

Hope this helps…………