diff -aur asterisk-13.4.0.orig/res/res_rtp_asterisk.c asterisk-13.4.0.patched/res/res_rtp_asterisk.c
--- asterisk-13.4.0.orig/res/res_rtp_asterisk.c	2015-06-04 19:20:51.000000000 +0600
+++ asterisk-13.4.0.patched/res/res_rtp_asterisk.c	2016-11-19 04:19:31.734853221 +0700
@@ -3415,7 +3415,7 @@
 	if (rtp->smoother) {
 		struct ast_frame *f;
 
-		if (ast_smoother_test_flag(rtp->smoother, AST_SMOOTHER_FLAG_BE)) {
+		if (ast_smoother_test_flag(rtp->smoother, AST_SMOOTHER_FLAG_BE) || ast_format_cache_is_slinear(format)) {
 			ast_smoother_feed_be(rtp->smoother, frame);
 		} else {
 			ast_smoother_feed(rtp->smoother, frame);
@@ -3434,6 +3434,8 @@
 			f = frame;
 		}
 		if (f->data.ptr) {
+			if(ast_format_cache_is_slinear(format))
+				ast_frame_byteswap_be(f);
 			ast_rtp_raw_write(instance, f, codec);
 		}
 		if (f != frame) {
diff -aur asterisk-13.4.0.orig/res/res_rtp_multicast.c asterisk-13.4.0.patched/res/res_rtp_multicast.c
--- asterisk-13.4.0.orig/res/res_rtp_multicast.c	2015-06-04 19:20:51.000000000 +0600
+++ asterisk-13.4.0.patched/res/res_rtp_multicast.c	2016-11-19 04:23:58.582334094 +0700
@@ -251,6 +251,10 @@
 		return -1;
 	}
 
+	if (ast_format_cache_is_slinear(frame->subclass.format)) {
+		ast_frame_byteswap_be(frame);
+	}
+
 	/* If we do not have space to construct an RTP header duplicate the frame so we get some */
 	if (frame->offset < hdrlen) {
 		f = ast_frdup(frame);