4452d530_able___FreeSWITCH___Confluence__Description
[ITU-T Q.850 Code] 43 [Enumeration] ACCESS_INFO_DISCARDED [Cause] access information discarded [Q.850] [Description] 
This cause indicates that the network could not deliver access information to the remote user as requested, i.e. user-to-user information, low layer compatibility, high layer compatibility or sub-address as indicated in the diagnostic. It is noted that the particular type of access information discarded is optionally included in the diagnostic.
Hangup Cause Code Table - FreeSWITCH - Confluence
Description