SIP CodeCause String 
401CALL_REJECTED 
402CALL_REJECTED 
403CALL_REJECTED 
407CALL_REJECTED 
603CALL_REJECTED 
404UNALLOCATED_NUMBER 
485NO_ROUTE_DESTINATION 
604NO_ROUTE_DESTINATION 
408RECOVERY_ON_TIMER_EXPIRE 
504RECOVERY_ON_TIMER_EXPIRE 
410NUMBER_CHANGED 
413SWITCH_CAUSE_INTERWORKING 
414SWITCH_CAUSE_INTERWORKING 
416SWITCH_CAUSE_INTERWORKING 
420SWITCH_CAUSE_INTERWORKING 
421SWITCH_CAUSE_INTERWORKING 
423SWITCH_CAUSE_INTERWORKING 
505SWITCH_CAUSE_INTERWORKING 
513SWITCH_CAUSE_INTERWORKING 
480CAUSE_NO_USER_RESPONSE 
400NORMAL_TEMPORARY_FAILURE 
481NORMAL_TEMPORARY_FAILURE 
500NORMAL_TEMPORARY_FAILURE 
503NORMAL_TEMPORARY_FAILURE 
486USER_BUSY 
600USER_BUSY 
484INVALID_NUMBER_FORMAT 
488INCOMPATIBLE_DESTINATION 
606INCOMPATIBLE_DESTINATION 
502NETWORK_OUT_OF_ORDER 
405SERVICE_UNAVAILABLE 
406SERVICE_NOT_IMPLEMENTED 
415SERVICE_NOT_IMPLEMENTED 
501SERVICE_NOT_IMPLEMENTED 
482EXCHANGE_ROUTING_ERROR 
483EXCHANGE_ROUTING_ERROR 
487ORIGINATOR_CANCEL 
OthersNORMAL_UNSPECIFIED