4452d530_able___FreeSWITCH___Confluence__Description
[ITU-T Q.850 Code] 3 [SIP Equiv.] 404 [Enumeration] NO_ROUTE_DESTINATION [Cause] No route to destination [Q.850] [Description] 
This cause indicates that the called party cannot be reached because the network through which the call has been routed does not serve the destination desired. This cause is supported on a network dependent basis.
Hangup Cause Code Table - FreeSWITCH - Confluence
Description