4452d530_able___FreeSWITCH___Confluence__Description
[ITU-T Q.850 Code] 25 [SIP Equiv.] 483 [Enumeration] EXCHANGE_ROUTING_ERROR [Description] 
This cause indicates that the destination indicated by the user cannot be reached, because an intermediate exchange has released the call due to reaching a limit in executing the hop counter procedure. This cause is generated by an intermediate node, which when decrementing the hop counter value, gives the result 0.
Hangup Cause Code Table - FreeSWITCH - Confluence
Description