--- chan_sip.c	2009-04-29 11:25:49.000000000 -0300
+++ chan_sip.c	2009-04-29 11:25:49.000000000 -0300
@@ -3383,7 +3383,7 @@
 		case 409:	/* Conflict */
 			return AST_CAUSE_NORMAL_TEMPORARY_FAILURE;
 		case 410:	/* Gone */
-			return AST_CAUSE_UNALLOCATED;
+			return AST_CAUSE_NUMBER_CHANGED;
 		case 411:	/* Length required */
 			return AST_CAUSE_INTERWORKING;
 		case 413:	/* Request entity too large */