diff --git a/channels/chan_zap.c b/channels/chan_zap.c
index 05a168201a..c421fec700 100755
--- a/channels/chan_zap.c
+++ b/channels/chan_zap.c
@@ -2876,7 +2876,10 @@ static int zt_bridge(struct ast_channel *c0, struct ast_channel *c1, int flags,
 #ifdef PRI_2BCT
 		q931c0 = p0->call;
 		q931c1 = p1->call;
-		if (q931c0 && q931c1 && !triedtopribridge) {
+		if (p0->tranfer && p1->transfer 
+				&& q931c0 && q931c1 
+				&& !triedtopribridge) {
+
 			pri_channel_bridge(q931c0, q931c1);
 			triedtopribridge = 1;
 		}