diff --git a/msc/BSC_ConnectionHandler.ttcn b/msc/BSC_ConnectionHandler.ttcn
index 2cd666f..e6cf2b0 100644
--- a/msc/BSC_ConnectionHandler.ttcn
+++ b/msc/BSC_ConnectionHandler.ttcn
@@ -532,8 +532,10 @@
 		valueof(ts_BSSMAP_IE_AoIP_TLA4(f_inet_addr(cpars.mgw_rtp_ip_bss),cpars.mgw_rtp_port_bss));
 	BSSAP.receive(tr_BSSMAP_AssignmentReq(omit, tla_ass)) {
 		var BSSMAP_IE_AoIP_TransportLayerAddress tla;
+		var BSSMAP_IE_SpeechCodec codec;
 		tla := valueof(ts_BSSMAP_IE_AoIP_TLA4(f_inet_addr(cpars.bss_rtp_ip), cpars.bss_rtp_port));
-		BSSAP.send(ts_BSSMAP_AssignmentComplete(omit, tla));
+		codec := valueof(ts_BSSMAP_IE_SpeechCodec({ts_CodecFR}));
+		BSSAP.send(ts_BSSMAP_AssignmentComplete(omit, tla, codec));
 		}
 
 	/* MS -> MSC: ALERTING */
@@ -633,8 +635,10 @@
 	/* expect AoIP IP/Port to match what we returned in CRCX_ACK above */
 	[] BSSAP.receive(tr_BSSMAP_AssignmentReq(omit, tla_ass)) {
 		var BSSMAP_IE_AoIP_TransportLayerAddress tla;
+		var BSSMAP_IE_SpeechCodec codec;
 		tla := valueof(ts_BSSMAP_IE_AoIP_TLA4(f_inet_addr(cpars.bss_rtp_ip), cpars.bss_rtp_port));
-		BSSAP.send(ts_BSSMAP_AssignmentComplete(omit, tla));
+		codec := valueof(ts_BSSMAP_IE_SpeechCodec({ts_CodecFR}));
+		BSSAP.send(ts_BSSMAP_AssignmentComplete(omit, tla, codec));
 		}
 	}