What is the usual procedure taken if an unrecognized non-mandatory ISDN IE is received by a network?
Options
A.Final handle the call
B.Final handle the call if 2 such IE is received
C.Ignore only if the IE received is not CS0, otherwise final handle the call
D.Send a Facility msg to the user notifying the user of sending unknown IEs but don't final handle
E.Ignore the IEs
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