diff --git a/res/res_agi.c b/res/res_agi.c
index 4bcc610f2e..05119c9c43 100755
--- a/res/res_agi.c
+++ b/res/res_agi.c
@@ -396,11 +396,11 @@ static int handle_tddmode(struct ast_channel *chan, AGI *agi, int argc, char *ar
 	if (!strncasecmp(argv[2],"mate",4)) x = 2;
 	if (!strncasecmp(argv[2],"tdd",3)) x = 1;
 	res = ast_channel_setoption(chan,AST_OPTION_TDD,&x,sizeof(char),0);
-	fdprintf(agi->fd, "200 result=%d\n", res);
-	if (res >= 0) 
-		return RESULT_SUCCESS;
+	if (res == RESULT_SUCCESS)
+		fprintf(agi->fd, "200 result=1\n");
 	else
-		return RESULT_FAILURE;
+		fprintf(agi->fd, "200 result=0\n");
+	return RESULT_SUCCESS;
 }
 
 static int handle_sendimage(struct ast_channel *chan, AGI *agi, int argc, char *argv[])