diff --git a/src/remsim_client.c b/src/remsim_client.c
index e4bffa6..2469ac5 100644
--- a/src/remsim_client.c
+++ b/src/remsim_client.c
@@ -46,7 +46,7 @@
 {
 	RsproPDU_t *pdu = rspro_dec_msg(msg);
 	if (!pdu) {
-		fprintf(stderr, "Error decoding PDU\n");
+		LOGPFSML(bc->bankd_fi, LOGL_ERROR, "Error decoding PDU\n");
 		return -1;
 	}
 
@@ -59,7 +59,8 @@
 		osmo_fsm_inst_dispatch(bc->bankd_fi, BDC_E_CLIENT_CONN_RES, pdu);
 		break;
 	default:
-		fprintf(stderr, "Unknown/Unsuppoerted RSPRO PDU: %s\n", msgb_hexdump(msg));
+		LOGPFSML(bc->bankd_fi, LOGL_ERROR, "Unknown/Unsuppoerted RSPRO PDU %s: %s\n",
+			 rspro_msgt_name(pdu), msgb_hexdump(msg));
 		return -1;
 	}
 
@@ -96,7 +97,7 @@
 		msg->l2h = &he->data[0];
 		switch (he->proto) {
 		case IPAC_PROTO_EXT_RSPRO:
-			printf("Received RSPRO %s\n", msgb_hexdump(msg));
+			LOGPFSML(bc->bankd_fi, LOGL_DEBUG, "Received RSPRO %s\n", msgb_hexdump(msg));
 			rc = bankd_handle_msg(bc, msg);
 			break;
 		default:
@@ -152,7 +153,8 @@
 		server_conn_send_rspro(srvc, resp);
 		break;
 	default:
-		fprintf(stderr, "Unknown/Unsupported RSPRO PDU type: %u\n", pdu->msg.present);
+		LOGPFSML(srvc->fi, LOGL_ERROR, "Unknown/Unsupported RSPRO PDU type: %s\n",
+			 rspro_msgt_name(pdu));
 		return -1;
 	}
 
diff --git a/src/simtrace2-remsim_client.c b/src/simtrace2-remsim_client.c
index f5c01bc..ae7c015 100644
--- a/src/simtrace2-remsim_client.c
+++ b/src/simtrace2-remsim_client.c
@@ -559,7 +559,7 @@
 {
 	RsproPDU_t *pdu = rspro_dec_msg(msg);
 	if (!pdu) {
-		fprintf(stderr, "Error decoding PDU\n");
+		LOGPFSML(bc->bankd_fi, LOGL_ERROR, "Error decoding PDU\n");
 		return -1;
 	}
 
@@ -573,7 +573,8 @@
 		bankd_handle_tpduCardToModem(bc, pdu);
 		break;
 	default:
-		fprintf(stderr, "Unknown/Unsuppoerted RSPRO PDU: %s\n", msgb_hexdump(msg));
+		LOGPFSML(bc->bankd_fi, LOGL_ERROR, "Unknown/Unsuppoerted RSPRO PDU %s: %s\n",
+			 rspro_msgt_name(pdu), msgb_hexdump(msg));
 		return -1;
 	}
 
@@ -599,7 +600,7 @@
 	if (he->proto != IPAC_PROTO_EXT_RSPRO)
 		goto invalid;
 
-	printf("Received RSPRO %s\n", msgb_hexdump(msg));
+	LOGPFSML(bc->bankd_fi, LOGL_DEBUG, "Received RSPRO %s\n", msgb_hexdump(msg));
 
 	rc = bankd_handle_msg(bc, msg);
 
@@ -643,7 +644,8 @@
 		server_conn_send_rspro(srvc, resp);
 		break;
 	default:
-		fprintf(stderr, "Unknown/Unsupported RSPRO PDU type: %u\n", pdu->msg.present);
+		LOGPFSML(srvc->fi, LOGL_ERROR, "Unknown/Unsupported RSPRO PDU type: %s\n",
+			 rspro_msgt_name(pdu));
 		return -1;
 	}