Fix native bridge not to intercept DTMF if it's needed

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@5009 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_iax2.c

@@ -2715,8 +2715,10 @@ static int iax2_bridge(struct ast_channel *c0, struct ast_channel *c1, int flags
 
 	lock_both(callno0, callno1);
 	/* Put them in native bridge mode */
-	iaxs[callno0]->bridgecallno = callno1;
-	iaxs[callno1]->bridgecallno = callno0;
+	if (!flags & (AST_BRIDGE_DTMF_CHANNEL_0 | AST_BRIDGE_DTMF_CHANNEL_1)) {
+		iaxs[callno0]->bridgecallno = callno1;
+		iaxs[callno1]->bridgecallno = callno0;
+	}
 	unlock_both(callno0, callno1);
 
 	/* If not, try to bridge until we can execute a transfer, if we can */