diff --git a/openbsc/src/libtrau/rtp_proxy.c b/openbsc/src/libtrau/rtp_proxy.c
index 52616a0..82f4063 100644
--- a/openbsc/src/libtrau/rtp_proxy.c
+++ b/openbsc/src/libtrau/rtp_proxy.c
@@ -206,6 +206,7 @@
 	int payload_type;
 	int payload_len;
 	int duration; /* in samples */
+	int is_bfi = 0;
 
 	if (rs->tx_action != RTP_SEND_DOWNSTREAM) {
 		/* initialize sequences */
@@ -236,6 +237,12 @@
 		payload_len = frame->data[0];
 		duration = RTP_GSM_DURATION;
 		break;
+	case GSM_BAD_FRAME:
+		payload_type = 0;
+		payload_len = 0;
+		duration = RTP_GSM_DURATION;
+		is_bfi = 1;
+		break;
 	default:
 		DEBUGPC(DLMUX, "unsupported message type %d\n",
 			frame->msg_type);
@@ -248,6 +255,13 @@
 		return -EINVAL;
 	}
 
+	if (is_bfi) {
+		/* In case of a bad frame, just count and drop packet. */
+		rs->transmit.timestamp += duration;
+		rs->transmit.sequence++;
+		return 0;
+	}
+
 	msg = msgb_alloc(sizeof(struct rtp_hdr) + payload_len, "RTP-GSM");
 	if (!msg)
 		return -ENOMEM;
diff --git a/openbsc/src/libtrau/trau_mux.c b/openbsc/src/libtrau/trau_mux.c
index 3831a80..b37c765 100644
--- a/openbsc/src/libtrau/trau_mux.c
+++ b/openbsc/src/libtrau/trau_mux.c
@@ -245,7 +245,10 @@
 		i++;
 		j++;
 	}
-	frame->msg_type = GSM_TCHF_FRAME;
+	if (tf->c_bits[11]) /* BFI */
+		frame->msg_type = GSM_BAD_FRAME;
+	else
+		frame->msg_type = GSM_TCHF_FRAME;
 	frame->callref = callref;
 	msgb_put(msg, sizeof(struct gsm_data_frame) + 33);