diff --git a/mgw/MGCP_Test.ttcn b/mgw/MGCP_Test.ttcn
index 5ff5247..3b49afc 100644
--- a/mgw/MGCP_Test.ttcn
+++ b/mgw/MGCP_Test.ttcn
@@ -1339,7 +1339,7 @@
 		return true;
 	}
 
-	function f_TC_two_crcx_and_rtp_osmux(boolean bidir,
+	function f_TC_two_crcx_and_rtp_osmux(boolean bidir, boolean rtp_amr_oa,
 					     charstring local_ip_rtp, charstring remote_ip_rtp,
 					     charstring local_ip_osmux, charstring remote_ip_osmux) runs on dummy_CT {
 		var RtpFlowData flow[2];
@@ -1350,15 +1350,35 @@
 		var MgcpCallId call_id := '1226'H;
 		var integer tolerance := 0;
 
+		var octetstring amr_payload;
+		var charstring fmtp;
+
 		f_init(ep, true);
 
+		var AMRFT cmr := AMR_FT_0;
+		var AMRFT ft := AMR_FT_2;
+		if (rtp_amr_oa) {
+			fmtp := "octet-align=1";
+			var RTP_AMR_Hdr amr_oa_hdr := valueof(ts_RTP_AMR_Hdr(enum2int(cmr), enum2int(ft)));
+			amr_payload := enc_RTP_AMR_Hdr(amr_oa_hdr) &
+				       f_osmux_gen_expected_rx_rtp_payload(enum2int(ft), c_OsmuxemDefaultCfg.tx_fixed_payload);
+		} else {
+			fmtp := "octet-align=0";
+			/* Convert OA to BWE: */
+			var RTP_AMR_BWE_Hdr amr_bwe_hdr := valueof(ts_RTP_AMR_BWE_Hdr(enum2int(cmr), enum2int(ft)));
+			var bitstring amr_bwe_hdr_bits := substr(oct2bit(enc_RTP_AMR_BWE_Hdr(amr_bwe_hdr)), 0 , 10);
+			var bitstring amr_data_bits := oct2bit(f_osmux_gen_expected_rx_rtp_payload(enum2int(ft), c_OsmuxemDefaultCfg.tx_fixed_payload));
+			var bitstring amr_payload_bits := amr_bwe_hdr_bits & substr(amr_data_bits, 0, f_amrft_payload_bits_len(enum2int(ft)));
+			amr_payload := bit2oct(f_pad_bit(amr_payload_bits, (lengthof(amr_payload_bits)+7)/8*8, '0'B));
+		};
+
 		/* from us to MGW */
 		flow[0] := valueof(t_RtpFlow(local_ip_rtp, remote_ip_rtp, 112, "AMR/8000"));
 		flow[0].rtp_cfg := c_RtpemDefaultCfg
 		flow[0].rtp_cfg.tx_payload_type := flow[0].pt;
-		/* 0014 is the ToC (CMR=AMR4.75) in front of AMR Payload in RTP Payload */
-		flow[0].rtp_cfg.rx_fixed_payload := '0014'O & f_osmux_gen_expected_rx_rtp_payload(2 /* AMR_FT_2, 5.90 */, c_OsmuxemDefaultCfg.tx_fixed_payload);
-		flow[0].rtp_cfg.tx_fixed_payload := flow[0].rtp_cfg.rx_fixed_payload;
+		flow[0].rtp_cfg.rx_fixed_payload := amr_payload;
+		flow[0].rtp_cfg.tx_fixed_payload := amr_payload;
+		flow[0].fmtp := fmtp;
 		/* bind local RTP emulation sockets */
 		flow[0].em.portnr := 10000;
 		f_flow_create(RTPEM[0], ep, call_id, "sendrecv", flow[0]);
@@ -1409,30 +1429,39 @@
 
 	/* create one RTP and one OSmux emulations; create two connections on MGW EP, exchange some data */
 	testcase TC_two_crcx_and_rtp_osmux() runs on dummy_CT {
-		 f_TC_two_crcx_and_rtp_osmux(false, mp_local_ipv4, mp_remote_ipv4,
+		 f_TC_two_crcx_and_rtp_osmux(false, true, mp_local_ipv4, mp_remote_ipv4,
 					     mp_local_ipv4, mp_remote_ipv4);
 	}
 
 	/* create one RTP and one OSmux emulations; create two connections on MGW EP,
 	 * exchange some data in both directions */
 	testcase TC_two_crcx_and_rtp_osmux_bidir() runs on dummy_CT {
-		 f_TC_two_crcx_and_rtp_osmux(true, mp_local_ipv4, mp_remote_ipv4,
+		 f_TC_two_crcx_and_rtp_osmux(true, true, mp_local_ipv4, mp_remote_ipv4,
 					     mp_local_ipv4, mp_remote_ipv4);
 	}
 
+	/* create one RTP and one OSmux emulations; create two connections on MGW EP,
+	 * exchange some data in both directions. RTP side is configured to
+	 * rx/rx AMR in bandwidth-efficient mode. */
+	testcase TC_two_crcx_and_rtp_osmux_bidir_amr_bwe() runs on dummy_CT {
+		 f_TC_two_crcx_and_rtp_osmux(true, false, mp_local_ipv4, mp_remote_ipv4,
+					     mp_local_ipv4, mp_remote_ipv4);
+	}
+
+
 	/* Same as TC_two_crcx_and_rtp_osmux_bidir, but using IPv6 */
 	testcase TC_two_crcx_and_rtp_osmux_bidir_ipv6() runs on dummy_CT {
-		 f_TC_two_crcx_and_rtp_osmux(true, mp_local_ipv6, mp_remote_ipv6,
+		 f_TC_two_crcx_and_rtp_osmux(true, true, mp_local_ipv6, mp_remote_ipv6,
 					     mp_local_ipv6, mp_remote_ipv6);
 	}
 	/* Same as TC_two_crcx_and_rtp_osmux_bidir, but using IPv4 (RTP) and IPv6 (Osmux) */
 	testcase TC_two_crcx_and_rtp_osmux_bidir_ipv4_ipv6() runs on dummy_CT {
-		 f_TC_two_crcx_and_rtp_osmux(true, mp_local_ipv4, mp_remote_ipv4,
+		 f_TC_two_crcx_and_rtp_osmux(true, true, mp_local_ipv4, mp_remote_ipv4,
 					     mp_local_ipv6, mp_remote_ipv6);
 	}
 	/* Same as TC_two_crcx_and_rtp_osmux_bidir, but using IPv6 (RTP) and IPv4 (Osmux) */
 	testcase TC_two_crcx_and_rtp_osmux_bidir_ipv6_ipv4() runs on dummy_CT {
-		 f_TC_two_crcx_and_rtp_osmux(true, mp_local_ipv6, mp_remote_ipv6,
+		 f_TC_two_crcx_and_rtp_osmux(true, true, mp_local_ipv6, mp_remote_ipv6,
 					     mp_local_ipv4, mp_remote_ipv4);
 	}
 
@@ -2915,6 +2944,7 @@
 		execute(TC_one_crcx_loopback_osmux());
 		execute(TC_two_crcx_and_rtp_osmux());
 		execute(TC_two_crcx_and_rtp_osmux_bidir());
+		execute(TC_two_crcx_and_rtp_osmux_bidir_amr_bwe());
 		execute(TC_two_crcx_mdcx_and_rtp_osmux_wildcard());
 		execute(TC_two_crcx_mdcx_and_rtp_osmux_fixed());