4452d530_able___FreeSWITCH___Confluence__Description
[ITU-T Q.850 Code] 605 [Enumeration] PICKED_OFF [Description] 
This cause means the call was picked up by intercepting it from another extension (i.e. dialing **ext_number from another extension).
Hangup Cause Code Table - FreeSWITCH - Confluence
Description