diff --git a/openbsc/src/osmo-bsc_nat/bsc_nat.c b/openbsc/src/osmo-bsc_nat/bsc_nat.c
index 3ec43b1..4357485 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_nat.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_nat.c
@@ -442,7 +442,7 @@
 	con->msc_con = NULL;
 
 	/* 2. release the BSC side */
-	if (con->con_type == NAT_CON_TYPE_LU) {
+	if (con->filter_state.con_type == FLT_CON_TYPE_LU) {
 		struct msgb *payload, *udt;
 		payload = gsm48_create_loc_upd_rej(cause->lu_reject_cause);
 
@@ -470,7 +470,7 @@
 		return;
 	}
 
-	con->con_type = NAT_CON_TYPE_LOCAL_REJECT;
+	con->filter_state.con_type = FLT_CON_TYPE_LOCAL_REJECT;
 	bsc_write(bsc, rlsd, IPAC_PROTO_SCCP);
 }
 
@@ -481,9 +481,9 @@
 	struct msgb *payload;
 	struct msgb *refuse;
 
-	if (con_type == NAT_CON_TYPE_LU)
+	if (con_type == FLT_CON_TYPE_LU)
 		payload = gsm48_create_loc_upd_rej(cause->lu_reject_cause);
-	else if (con_type == NAT_CON_TYPE_CM_SERV_REQ || con_type == NAT_CON_TYPE_SSA)
+	else if (con_type == FLT_CON_TYPE_CM_SERV_REQ || con_type == FLT_CON_TYPE_SSA)
 		payload = gsm48_create_mm_serv_rej(cause->cm_reject_cause);
 	else {
 		LOGP(DNAT, LOGL_ERROR, "Unknown connection type: %d\n", con_type);
@@ -504,7 +504,7 @@
 			goto send_refuse;
 
 		/* declare it local and assign a unique remote_ref */
-		con->con_type = NAT_CON_TYPE_LOCAL_REJECT;
+		con->filter_state.con_type = FLT_CON_TYPE_LOCAL_REJECT;
 		con->con_local = NAT_CON_END_LOCAL;
 		con->has_remote_ref = 1;
 		con->remote_ref = con->patched_ref;
@@ -1072,7 +1072,7 @@
 			con = patch_sccp_src_ref_to_msc(msg, parsed, bsc);
 			con->msc_con = bsc->nat->msc_con;
 			con_msc = con->msc_con;
-			con->con_type = con_type;
+			con->filter_state.con_type = con_type;
 			con->filter_state.imsi_checked = filter;
 			bsc_nat_extract_lac(bsc, con, parsed, msg);
 			if (imsi)
diff --git a/openbsc/src/osmo-bsc_nat/bsc_nat_filter.c b/openbsc/src/osmo-bsc_nat/bsc_nat_filter.c
index 6883d66..393aea3 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_nat_filter.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_nat_filter.c
@@ -41,7 +41,7 @@
 	int hdr48_len;
 	int len;
 
-	*con_type = NAT_CON_TYPE_NONE;
+	*con_type = FLT_CON_TYPE_NONE;
 	cause->cm_reject_cause = GSM48_REJECT_PLMN_NOT_ALLOWED;
 	cause->lu_reject_cause = GSM48_REJECT_PLMN_NOT_ALLOWED;
 	*imsi = NULL;
diff --git a/openbsc/src/osmo-bsc_nat/bsc_nat_utils.c b/openbsc/src/osmo-bsc_nat/bsc_nat_utils.c
index 8921208..d95227d 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_nat_utils.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_nat_utils.c
@@ -403,13 +403,13 @@
 }
 
 static const char *con_types [] = {
-	[NAT_CON_TYPE_NONE] = "n/a",
-	[NAT_CON_TYPE_LU] = "Location Update",
-	[NAT_CON_TYPE_CM_SERV_REQ] = "CM Serv Req",
-	[NAT_CON_TYPE_PAG_RESP] = "Paging Response",
-	[NAT_CON_TYPE_SSA] = "Supplementar Service Activation",
-	[NAT_CON_TYPE_LOCAL_REJECT] = "Local Reject",
-	[NAT_CON_TYPE_OTHER] = "Other",
+	[FLT_CON_TYPE_NONE] = "n/a",
+	[FLT_CON_TYPE_LU] = "Location Update",
+	[FLT_CON_TYPE_CM_SERV_REQ] = "CM Serv Req",
+	[FLT_CON_TYPE_PAG_RESP] = "Paging Response",
+	[FLT_CON_TYPE_SSA] = "Supplementar Service Activation",
+	[FLT_CON_TYPE_LOCAL_REJECT] = "Local Reject",
+	[FLT_CON_TYPE_OTHER] = "Other",
 };
 
 const char *bsc_con_type_to_string(int type)
@@ -423,18 +423,18 @@
 }
 
 static const int con_to_ctr[] = {
-	[NAT_CON_TYPE_NONE]		= -1,
-	[NAT_CON_TYPE_LU]		= BCFG_CTR_CON_TYPE_LU,
-	[NAT_CON_TYPE_CM_SERV_REQ]	= BCFG_CTR_CON_CMSERV_RQ,
-	[NAT_CON_TYPE_PAG_RESP]		= BCFG_CTR_CON_PAG_RESP,
-	[NAT_CON_TYPE_SSA]		= BCFG_CTR_CON_SSA,
-	[NAT_CON_TYPE_LOCAL_REJECT]	= -1,
-	[NAT_CON_TYPE_OTHER]		= BCFG_CTR_CON_OTHER,
+	[FLT_CON_TYPE_NONE]		= -1,
+	[FLT_CON_TYPE_LU]		= BCFG_CTR_CON_TYPE_LU,
+	[FLT_CON_TYPE_CM_SERV_REQ]	= BCFG_CTR_CON_CMSERV_RQ,
+	[FLT_CON_TYPE_PAG_RESP]		= BCFG_CTR_CON_PAG_RESP,
+	[FLT_CON_TYPE_SSA]		= BCFG_CTR_CON_SSA,
+	[FLT_CON_TYPE_LOCAL_REJECT]	= -1,
+	[FLT_CON_TYPE_OTHER]		= BCFG_CTR_CON_OTHER,
 };
 
 int bsc_conn_type_to_ctr(struct nat_sccp_connection *conn)
 {
-	return con_to_ctr[conn->con_type];
+	return con_to_ctr[conn->filter_state.con_type];
 }
 
 int bsc_write_cb(struct osmo_fd *bfd, struct msgb *msg)
diff --git a/openbsc/src/osmo-bsc_nat/bsc_nat_vty.c b/openbsc/src/osmo-bsc_nat/bsc_nat_vty.c
index 596ecae..821e522 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_nat_vty.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_nat_vty.c
@@ -189,7 +189,7 @@
 			con->has_remote_ref,
 			sccp_src_ref_to_int(&con->remote_ref),
 			con->msc_endp, con->bsc_endp,
-			bsc_con_type_to_string(con->con_type),
+			bsc_con_type_to_string(con->filter_state.con_type),
 			VTY_NEWLINE);
 	}
 
diff --git a/openbsc/src/osmo-bsc_nat/bsc_ussd.c b/openbsc/src/osmo-bsc_nat/bsc_ussd.c
index 2241896..1082414 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_ussd.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_ussd.c
@@ -382,7 +382,7 @@
 	 * decode if the connection was created for USSD, we do have a USSD access
 	 * list, a query, a IMSI and such...
 	 */
-	if (con->con_type != NAT_CON_TYPE_SSA)
+	if (con->filter_state.con_type != FLT_CON_TYPE_SSA)
 		return 0;
 
 	if (!con->filter_state.imsi)