Patent ID: 8380211

Claim:
A Circuit Switched domain call routing method, comprising: receiving, by a GMSC, routing-controlled information of a call carried in a call initiation message; indicating, by the GMSC, that the call has been subject to routing control by sending the routing-controlled information of the call to a gsmSCF; determining, by the gsmSCF, that the call has been subject to routing control in accordance with the routing-controlled information; sending, by the gsmSCF, a Continue message to the GMSC directly after the gsmSCF determines that the call has been subject to routing control; and sending, by the GMSC, to an HLR an SRI message carrying a suppress T-CSI parameter upon receipt of the Continue message; wherein the routing-controlled information is a CSRN, the method further comprising, before the step of indicating: triggering, by the GMSC, an intelligent service for the CSRN on the basis of N-CSI configured beforehand at the GMSC.