4452d530_able___FreeSWITCH___Confluence__Description
[ITU-T Q.850 Code] 103 [Enumeration] MANDATORY_IE_LENGTH_ERROR [Cause] parameter non-existent or not implemented - passed on (national use) [Q.850] [Description] 
This cause indicates that the equipment sending this cause has received a message which includes parameters not recognized because the parameters are not defined or are defined but not implemented by the equipment sending this cause. The cause indicates that the parameter(s) were ignored. In addition, if the equipment sending this cause is an intermediate point, then this cause indicates that the parameter(s) were passed unchanged.
Hangup Cause Code Table - FreeSWITCH - Confluence
Description