Index: channels/chan_dahdi.c
===================================================================
--- channels/chan_dahdi.c	(revision 257184)
+++ channels/chan_dahdi.c	(working copy)
@@ -5158,7 +5158,7 @@
 		return &p->subs[index].f;
 	}
 
-	if (p->subs[index].needcallerid) {
+	if (p->subs[index].needcallerid && !ast->cid.cid_tns) {
 		ast_set_callerid(ast, S_OR(p->lastcid_num, NULL),
 							S_OR(p->lastcid_name, NULL),
 							S_OR(p->lastcid_num, NULL)
@@ -9689,12 +9689,12 @@
 					if (chanpos < 0) {
 						ast_log(LOG_WARNING, "Facility Name requested on channel %d/%d not in use on span %d\n", 
 							PRI_SPAN(e->facname.channel), PRI_CHANNEL(e->facname.channel), pri->span);
-					} else {
+					} else if (pri->pvts[chanpos]->use_callerid) {
 						/* Re-use *69 field for PRI */
 						ast_mutex_lock(&pri->pvts[chanpos]->lock);
 						ast_copy_string(pri->pvts[chanpos]->lastcid_num, e->facname.callingnum, sizeof(pri->pvts[chanpos]->lastcid_num));
 						ast_copy_string(pri->pvts[chanpos]->lastcid_name, e->facname.callingname, sizeof(pri->pvts[chanpos]->lastcid_name));
-						pri->pvts[chanpos]->subs[SUB_REAL].needcallerid =1;
+						pri->pvts[chanpos]->subs[SUB_REAL].needcallerid = 1;
 						dahdi_enable_ec(pri->pvts[chanpos]);
 						ast_mutex_unlock(&pri->pvts[chanpos]->lock);
 					}
Index: funcs/func_callerid.c
===================================================================
--- funcs/func_callerid.c	(revision 257184)
+++ funcs/func_callerid.c	(working copy)
@@ -114,6 +114,7 @@
 static int callerid_write(struct ast_channel *chan, char *cmd, char *data,
 			  const char *value)
 {
+	int valid = 1;
 	if (!value || !chan)
 		return -1;
 
@@ -157,8 +158,13 @@
 		ast_channel_unlock(chan);
 	} else {
 		ast_log(LOG_ERROR, "Unknown callerid data type '%s'.\n", data);
+		valid = 0;
 	}
 
+	if (valid) {
+		chan->cid.cid_tns = 1;
+	}
+
 	return 0;
 }