diff --git a/library/OSMUX_Emulation.ttcn b/library/OSMUX_Emulation.ttcn
index 10338d275..c6999ded9 100644
--- a/library/OSMUX_Emulation.ttcn
+++ b/library/OSMUX_Emulation.ttcn
@@ -67,6 +67,8 @@ type component OSMUX_Emulation_CT {
 
 	/* user-facing port for controlling the binding */
 	port OsmuxEM_CTRL_PT CTRL;
+	/* user-facing port for sniffing Osmux frames */
+	port OsmuxEM_DATA_PT DATA;
 
 	/* configurable by user, should be fixed */
 	var OsmuxemConfig g_cfg := c_OsmuxemDefaultCfg;
@@ -190,6 +192,10 @@ type port OsmuxEM_CTRL_PT procedure {
 	      OsmuxEM_stats_get, OsmuxEM_register_rxhandle, OsmuxEM_register_txhandle;
 } with { extension "internal" };
 
+type port OsmuxEM_DATA_PT message {
+	inout OSMUX_PDU;
+} with { extension "internal" };
+
 function f_osmuxem_bind(OsmuxEM_CTRL_PT pt, in HostName local_host, inout PortNumber local_port) {
 	pt.call(OsmuxEM_bind:{local_host, local_port}) {
 		[] pt.getreply(OsmuxEM_bind:{local_host, ?}) -> param (local_port) {};
@@ -556,6 +562,9 @@ function f_main() runs on OSMUX_Emulation_CT
 			if (ispresent(g_cfg.rx_fixed_payload) and rx_osmux.msg.osmux_amr.data != payload_truncated) {
 				g_stat.num_pkts_rx_err_payload := g_stat.num_pkts_rx_err_payload + 1;
 			}
+			if (DATA.checkstate("Connected")) {
+				DATA.send(rx_osmux.msg);
+			}
 		}
 		/* process received Osmux Dummy if receiver enabled */
 		[g_rx_enabled] OSMUX.receive(tr_osmux_dummy) -> value rx_osmux {