diff --git a/library/MGCP_Templates.ttcn b/library/MGCP_Templates.ttcn
index 79d9670..917ef89 100644
--- a/library/MGCP_Templates.ttcn
+++ b/library/MGCP_Templates.ttcn
@@ -55,6 +55,12 @@
 		val := f_mgcp_osmux_cid_encode(osmux_cid)
 	};
 
+	/* Osmocom extension: X-Osmux: {*,%u} */
+	template MgcpParameter t_MgcpParOsmoIGN(template charstring val) := {
+		code := "X-OSMO-IGN",
+		val := val
+	};
+
 	/* osmo-bsc_mgcp implements L/C/M/X only, osmo-mgw adds 'I' */
 	/* SDP: osmo-bsc_mgcp implements Tx of v,o,s,c,t,m,a */
 
diff --git a/library/MGCP_Types.ttcn b/library/MGCP_Types.ttcn
index b56734c..01d4d3a 100644
--- a/library/MGCP_Types.ttcn
+++ b/library/MGCP_Types.ttcn
@@ -30,8 +30,8 @@
 	type charstring MgcpInfoCode ("B", "C", "I", "N", "X", "L", "M", "R",
 				      "S", "D", "O", "P", "E", "Z", "Q", "T",
 				      "RC", "LC", "A", "ES", "RM", "RD", "PL",
-				      "MD", "X-OSMO-CP", "X-OSMUX") with {
-		variant "TEXT_CODING(,convert=upper_case,'([BCINXLMRSDOPEZQTA])|(RC)|(LC)|(ES)|(RM)|(RD)|(PL)|(MD)|(X-OSMO-CP)|(X-OSMUX)',case_insensitive)"
+				      "MD", "X-OSMO-CP", "X-OSMO-IGN", "X-OSMUX") with {
+		variant "TEXT_CODING(,convert=upper_case,'([BCINXLMRSDOPEZQTA])|(RC)|(LC)|(ES)|(RM)|(RD)|(PL)|(MD)|(X-OSMO-CP)|(X-OSMO-IGN)|(X-OSMUX)',case_insensitive)"
 	};
 
 	/* 3.2.2.6 */
diff --git a/mgw/MGCP_Test.ttcn b/mgw/MGCP_Test.ttcn
index 4be034b..f6dfe57 100644
--- a/mgw/MGCP_Test.ttcn
+++ b/mgw/MGCP_Test.ttcn
@@ -732,6 +732,35 @@
 		setverdict(pass);
 	}
 
+	/* Test CRCX with X-Osmo-IGN, using same message as SYS#5063 to make sure it doesn't cause a crash. */
+	testcase TC_crcx_osmo_ign() runs on dummy_CT {
+		var template MgcpCommand cmd;
+		var MgcpResponse resp;
+		var MgcpEndpoint ep := "7@" & c_mgw_domain;
+		var MgcpCallId call_id := '3'H;
+
+		f_init(ep);
+
+		/* CRCX 1 7@mgw MGCP 1.0
+		C: 3
+		L: p:20, a:GSM-EFR, nt:IN
+		M: recvonly
+		X-Osmo-IGN: C
+		*/
+
+		cmd := ts_CRCX(get_next_trans_id(), ep, "netwtest", call_id);
+		cmd.params := {ts_MgcpParCallId(call_id),
+			       t_MgcpParLocConnOpt("p:20, a:GSM-EFR, nt:IN"),
+			       t_MgcpParConnMode("recvonly"),
+			       t_MgcpParOsmoIGN("C")};
+		resp := mgcp_transceive_mgw(cmd, tr_CRCX_ACK);
+		extract_conn_id(resp);
+
+		/* clean-up */
+		f_dlcx_ok(ep, call_id);
+		setverdict(pass);
+	}
+
 	/* test CRCX with early bi-directional mode, expect 527 as
 	 * bi-diretional media can only  be established once both local and
 	 * remote side are specified, see MGCP RFC */
@@ -2360,6 +2389,7 @@
 		execute(TC_crcx_no_lco());
 		execute(TC_crcx_noprefix());
 		execute(TC_crcx_unsupp_mode());
+		execute(TC_crcx_osmo_ign());
 		execute(TC_crcx_early_bidir_mode());
 		execute(TC_crcx_unsupp_param());
 		execute(TC_crcx_missing_callid());