4452d530_able___FreeSWITCH___Confluence__Description
[ITU-T Q.850 Code] 65 [SIP Equiv.] 488 [Enumeration] BEARERCAPABILITY_NOTIMPL [Cause] bearer capability not implemented [Q.850] [Description] 
This cause indicates that the equipment sending this cause does not support the bearer capability requested.
Hangup Cause Code Table - FreeSWITCH - Confluence
Description