--- asterisk-1.8.7.0/channels/chan_sip.c.orig	2011-10-13 13:36:45.000000000 -0400
+++ asterisk-1.8.7.0/channels/chan_sip.c	2011-10-13 13:37:23.000000000 -0400
@@ -20596,7 +20596,6 @@
 					/* Fall through */
 				case 486: /* Busy here */
 				case 600: /* Busy everywhere */
-				case 603: /* Decline */
 					if (p->owner) {
 						sip_handle_cc(p, req, AST_CC_CCBS);
 						ast_queue_control(p->owner, AST_CONTROL_BUSY);
@@ -20616,6 +20615,7 @@
 				case 502: /* Bad gateway */
 				case 503: /* Service Unavailable */
 				case 504: /* Server Timeout */
+				case 603: /* Decline */
 					if (owner)
 						ast_queue_control(p->owner, AST_CONTROL_CONGESTION);
 					break;