--- chan_dahdi.c.orig	2008-09-01 16:15:26.000000000 +0200
+++ chan_dahdi.c	2008-09-04 10:15:18.000000000 +0200
@@ -9589,7 +9589,8 @@
 						ss7_start_call(p, linkset);
 				} else {
 					ast_debug(1, "Call on CIC for unconfigured extension %s\n", p->exten);
-					isup_rel(ss7, e->iam.call, -1);
+					p->alreadyhungup = 1;
+					isup_rel(ss7, e->iam.call, AST_CAUSE_UNALLOCATED);
 				}
 				ast_mutex_unlock(&p->lock);
 				break;