The gsmSSF (GSM Service Switching Function) function interworks with the MSC/VLR and the GMSC. Based on information defined in the users subscription and sent from the HLR to the VLR triggers within the MSC and gsmSSF can be set. These triggers are used to dictate when the gsmSSF will communicate with the gsmSCF. This in turn will determine how IN based services are handled.
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