4452d530_able___FreeSWITCH___Confluence__Description
[ITU-T Q.850 Code] 100 [Enumeration] INVALID_IE_CONTENTS [Cause] Invalid information element contents [Q.850] [Description] 
This cause indicates that the equipment sending this cause has received and information element which it has implemented; however, one or more fields in the I.E. are coded in such a way which has not been implemented by the equipment sending this cause.
Hangup Cause Code Table - FreeSWITCH - Confluence
Description