Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 249623)
+++ channels/chan_sip.c	(working copy)
@@ -5673,7 +5673,7 @@
 				}
 			} else {	/* Incoming call, not up */
 				const char *res;
-				AST_SCHED_DEL(sched, p->provisional_keepalive_sched_id);
+				AST_SCHED_DEL_UNREF(sched, p->provisional_keepalive_sched_id, dialog_unref(p, "when you delete the provisional_keepalive_sched_id, you should dec the refcount for the stored dialog ptr"));
 				if (p->hangupcause && (res = hangup_cause2sip(p->hangupcause)))
 					transmit_response_reliable(p, res, &p->initreq);
 				else