4452d530_able___FreeSWITCH___Confluence__Description
[ITU-T Q.850 Code] 22 [SIP Equiv.] 410 [Enumeration] NUMBER_CHANGED [Cause] number changed [Q.850] [Description] 
This cause is returned to a calling party when the called party number indicated by the calling party is no longer assigned, The new called party number may optionally be included in the diagnostic field. If a network does not support this cause, cause no: 1, unallocated (unassigned) number shall be used.
Hangup Cause Code Table - FreeSWITCH - Confluence
Description