reject UPDATE

I am new to building HMRs.  I need to reject an UPDATE msg sent from our IVR as it is not supported by the Carrier.  Would it be best placed on the inbound or outbound maninpulation id?  Below is the HMR.

Thanks.

 

sip-manipulation
        name                      RejectUPDATE
        description       Reject UPDATE from CVP
        split-headers
        join-headers
        header-rule
                name                      rejectCVPUpdate
                header-name               To
                action                    reject
                comparison-type           case-sensitive
                msg-type                  any
                methods                   UPDATE
                match-value
                new-value                 405
         last-modified-by               admin@192.168.0.100
         last-modified-date             2011-02-22 22:24:02