For Antispam solution to work for MT part of SMS, SRI_SM needs to be routed towards Antispam server instead of HLR. This is achieved by modifying GT translation of MSISDN ranges on STP. ISR feature enables STP to distinguish SRI_SM from SRI_MT(for voice call) messages and send these two different types of SRI message to two different GT translations .e.g. SRI_SM can be sent to ANTISPAM while SRI_MT will be routed as usual towards HLR. In this way you will save capacity on Antispam by diverting SRI_MT call messages away from Antispam . In the absence of ISR feature SRI_MT messages will also be unnecessarily routed towards Antispam which will have a capacity impact on Antispam servers.
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