--- res/res_pjsip_dtmf_info.c	2016-02-05 21:32:40.000000000 +0100
+++ res/res_pjsip_dtmf_info.c	2016-03-16 12:58:25.000000000 +0100
@@ -98,11 +98,8 @@
 	is_dtmf = is_media_type(rdata, "dtmf");
 
 	if (!is_dtmf && !is_media_type(rdata, "dtmf-relay")) {
-		return 0;
-	}
-
-	if (!body || !body->len) {
-		/* need to return 200 OK on empty body */
+		/* Some SBCs uses SIP INFO as KEEPALIVE, 
+	 	 * need to return 200 OK on empty body */
 		send_response(session, rdata, 200);
 		return 0;
 	}