Paging response from ran to core over IU

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Hi ,

how to find paging response of paging request sent by MSS over IU interface . we have issue where Core is reporting many Paging messages are not replied by RNC . when we check wireshark we are not able to map paging request sent by Core with response . I tried SCCP.LR and TMSI?IMSI but i only see message from core no reply from RAN . Is there any other filter if we can use ?