diff --git a/include/osmocom/core/logging.h b/include/osmocom/core/logging.h
index fcf77f0..b3685b8 100644
--- a/include/osmocom/core/logging.h
+++ b/include/osmocom/core/logging.h
@@ -89,8 +89,6 @@
 #define LOGL_ERROR	7	/*!< \brief error condition, requires user action */
 #define LOGL_FATAL	8	/*!< \brief fatal, program aborted */
 
-#define LOG_FILTER_ALL	0x0001
-
 /* logging levels defined by the library itself */
 #define DLGLOBAL	-1	/*!< global logging */
 #define DLLAPD		-2	/*!< LAPD implementation */
@@ -126,6 +124,23 @@
 	void *ctx[LOG_MAX_CTX+1];
 };
 
+enum logging_ctx_items {
+	LOGGING_CTX_GB_NSVC,
+	LOGGING_CTX_GB_BVC,
+	LOGGING_CTX_BSC_SUBSCR,
+	LOGGING_CTX_VLR_SUBSCR,
+	_LOGGING_CTX_COUNT
+};
+
+enum logging_filters {
+	LOGGING_FILTER_ALL,
+	LOGGING_FILTER_GB_NSVC,
+	LOGGING_FILTER_GB_BVC,
+	LOGGING_FILTER_BSC_SUBSCR,
+	LOGGING_FILTER_VLR_SUBSCR,
+	_LOGGING_FILTER_COUNT
+};
+
 struct log_target;
 
 /*! \brief Log filter function */
diff --git a/include/osmocom/gprs/gprs_msgb.h b/include/osmocom/gprs/gprs_msgb.h
index 06f5cca..9ccc9a5 100644
--- a/include/osmocom/gprs/gprs_msgb.h
+++ b/include/osmocom/gprs/gprs_msgb.h
@@ -26,10 +26,6 @@
 #define msgb_bcid(__x)		LIBGB_MSGB_CB(__x)->bssgp_cell_id
 #define msgb_llch(__x)		LIBGB_MSGB_CB(__x)->llch
 
-/* logging contexts */
-#define GPRS_CTX_NSVC	0
-#define GPRS_CTX_BVC	1
-
 #include <osmocom/core/logging.h>
 int gprs_log_filter_fn(const struct log_context *ctx,
 			struct log_target *tar);
diff --git a/src/gb/common_vty.c b/src/gb/common_vty.c
index 5b20fcf..609ab3d 100644
--- a/src/gb/common_vty.c
+++ b/src/gb/common_vty.c
@@ -70,17 +70,17 @@
 int gprs_log_filter_fn(const struct log_context *ctx,
 			struct log_target *tar)
 {
-	const struct gprs_nsvc *nsvc = ctx->ctx[GPRS_CTX_NSVC];
-	const struct gprs_bvc *bvc = ctx->ctx[GPRS_CTX_BVC];
+	const struct gprs_nsvc *nsvc = ctx->ctx[LOGGING_CTX_GB_NSVC];
+	const struct gprs_bvc *bvc = ctx->ctx[LOGGING_CTX_GB_BVC];
 
 	/* Filter on the NS Virtual Connection */
-	if ((tar->filter_map & (1 << FLT_NSVC)) != 0
-	    && nsvc && (nsvc == tar->filter_data[FLT_NSVC]))
+	if ((tar->filter_map & (1 << LOGGING_FILTER_GB_NSVC)) != 0
+	    && nsvc && (nsvc == tar->filter_data[LOGGING_FILTER_GB_NSVC]))
 		return 1;
 
 	/* Filter on the NS Virtual Connection */
-	if ((tar->filter_map & (1 << FLT_BVC)) != 0
-	    && bvc && (bvc == tar->filter_data[FLT_BVC]))
+	if ((tar->filter_map & (1 << LOGGING_FILTER_GB_BVC)) != 0
+	    && bvc && (bvc == tar->filter_data[LOGGING_FILTER_GB_BVC]))
 		return 1;
 
 	return 0;
diff --git a/src/gb/common_vty.h b/src/gb/common_vty.h
index d8d0040..8c6b9ab 100644
--- a/src/gb/common_vty.h
+++ b/src/gb/common_vty.h
@@ -3,12 +3,6 @@
 
 extern int DNS, DBSSGP;
 
-enum log_filter {
-	_FLT_ALL = LOG_FILTER_ALL,	/* libosmocore */
-	FLT_NSVC = 1,
-	FLT_BVC  = 2,
-};
-
 extern struct cmd_element libgb_exit_cmd;
 extern struct cmd_element libgb_end_cmd;
 
diff --git a/src/gb/gprs_bssgp.c b/src/gb/gprs_bssgp.c
index 1ee942f..a402378 100644
--- a/src/gb/gprs_bssgp.c
+++ b/src/gb/gprs_bssgp.c
@@ -1049,7 +1049,7 @@
 	bctx = btsctx_by_bvci_nsei(bvci, msgb_nsei(msg));
 
 	if (bctx) {
-		log_set_context(GPRS_CTX_BVC, bctx);
+		log_set_context(LOGGING_CTX_GB_BVC, bctx);
 		rate_ctr_inc(&bctx->ctrg->ctr[BSSGP_CTR_PKTS_IN]);
 		rate_ctr_add(&bctx->ctrg->ctr[BSSGP_CTR_BYTES_IN],
 			     msgb_bssgp_len(msg));
diff --git a/src/gb/gprs_bssgp_vty.c b/src/gb/gprs_bssgp_vty.c
index 1f382a2..d8fc840 100644
--- a/src/gb/gprs_bssgp_vty.c
+++ b/src/gb/gprs_bssgp_vty.c
@@ -47,11 +47,11 @@
 				struct bssgp_bvc_ctx *bctx)
 {
 	if (bctx) {
-		target->filter_map |= (1 << FLT_BVC);
-		target->filter_data[FLT_BVC] = bctx;
-	} else if (target->filter_data[FLT_BVC]) {
-		target->filter_map = ~(1 << FLT_BVC);
-		target->filter_data[FLT_BVC] = NULL;
+		target->filter_map |= (1 << LOGGING_FILTER_GB_BVC);
+		target->filter_data[LOGGING_FILTER_GB_BVC] = bctx;
+	} else if (target->filter_data[LOGGING_FILTER_GB_BVC]) {
+		target->filter_map = ~(1 << LOGGING_FILTER_GB_BVC);
+		target->filter_data[LOGGING_FILTER_GB_BVC] = NULL;
 	}
 }
 
diff --git a/src/gb/gprs_ns.c b/src/gb/gprs_ns.c
index 18845d4..28f5ff3 100644
--- a/src/gb/gprs_ns.c
+++ b/src/gb/gprs_ns.c
@@ -325,7 +325,7 @@
 {
 	int ret;
 
-	log_set_context(GPRS_CTX_NSVC, nsvc);
+	log_set_context(LOGGING_CTX_GB_NSVC, nsvc);
 
 	/* Increment number of Uplink bytes */
 	rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_PKTS_OUT]);
@@ -360,7 +360,7 @@
 	struct msgb *msg = gprs_ns_msgb_alloc();
 	struct gprs_ns_hdr *nsh;
 
-	log_set_context(GPRS_CTX_NSVC, nsvc);
+	log_set_context(LOGGING_CTX_GB_NSVC, nsvc);
 
 	if (!msg)
 		return -ENOMEM;
@@ -384,7 +384,7 @@
 	uint16_t nsvci = htons(nsvc->nsvci);
 	uint16_t nsei = htons(nsvc->nsei);
 
-	log_set_context(GPRS_CTX_NSVC, nsvc);
+	log_set_context(LOGGING_CTX_GB_NSVC, nsvc);
 
 	if (!msg)
 		return -ENOMEM;
@@ -416,7 +416,7 @@
 	struct gprs_ns_hdr *nsh;
 	uint16_t nsvci = htons(nsvc->nsvci);
 
-	log_set_context(GPRS_CTX_NSVC, nsvc);
+	log_set_context(LOGGING_CTX_GB_NSVC, nsvc);
 
 	bvci = htons(bvci);
 
@@ -469,7 +469,7 @@
 	struct gprs_ns_hdr *nsh;
 	uint16_t nsvci = htons(nsvc->nsvci);
 
-	log_set_context(GPRS_CTX_NSVC, nsvc);
+	log_set_context(LOGGING_CTX_GB_NSVC, nsvc);
 
 	if (!msg)
 		return -ENOMEM;
@@ -497,7 +497,7 @@
  */
 int gprs_ns_tx_unblock(struct gprs_nsvc *nsvc)
 {
-	log_set_context(GPRS_CTX_NSVC, nsvc);
+	log_set_context(LOGGING_CTX_GB_NSVC, nsvc);
 	LOGP(DNS, LOGL_INFO, "NSEI=%u Tx NS UNBLOCK (NSVCI=%u)\n",
 		nsvc->nsei, nsvc->nsvci);
 
@@ -510,7 +510,7 @@
  */
 int gprs_ns_tx_alive(struct gprs_nsvc *nsvc)
 {
-	log_set_context(GPRS_CTX_NSVC, nsvc);
+	log_set_context(LOGGING_CTX_GB_NSVC, nsvc);
 	LOGP(DNS, LOGL_DEBUG, "NSEI=%u Tx NS ALIVE (NSVCI=%u)\n",
 		nsvc->nsei, nsvc->nsvci);
 
@@ -523,7 +523,7 @@
  */
 int gprs_ns_tx_alive_ack(struct gprs_nsvc *nsvc)
 {
-	log_set_context(GPRS_CTX_NSVC, nsvc);
+	log_set_context(LOGGING_CTX_GB_NSVC, nsvc);
 	LOGP(DNS, LOGL_DEBUG, "NSEI=%u Tx NS ALIVE_ACK (NSVCI=%u)\n",
 		nsvc->nsei, nsvc->nsvci);
 
@@ -548,7 +548,7 @@
 	enum ns_timeout tout = timer_mode_tout[mode];
 	unsigned int seconds = nsvc->nsi->timeout[tout];
 
-	log_set_context(GPRS_CTX_NSVC, nsvc);
+	log_set_context(LOGGING_CTX_GB_NSVC, nsvc);
 	DEBUGP(DNS, "NSEI=%u Starting timer in mode %s (%u seconds)\n",
 		nsvc->nsei, get_value_string(timer_mode_strs, mode),
 		seconds);
@@ -576,7 +576,7 @@
 	enum ns_timeout tout = timer_mode_tout[nsvc->timer_mode];
 	unsigned int seconds = nsvc->nsi->timeout[tout];
 
-	log_set_context(GPRS_CTX_NSVC, nsvc);
+	log_set_context(LOGGING_CTX_GB_NSVC, nsvc);
 	DEBUGP(DNS, "NSEI=%u Timer expired in mode %s (%u seconds)\n",
 		nsvc->nsei, get_value_string(timer_mode_strs, nsvc->timer_mode),
 		seconds);
@@ -638,7 +638,7 @@
 	struct gprs_ns_hdr *nsh;
 	uint16_t nsvci, nsei;
 
-	log_set_context(GPRS_CTX_NSVC, nsvc);
+	log_set_context(LOGGING_CTX_GB_NSVC, nsvc);
 	if (!msg)
 		return -ENOMEM;
 
@@ -692,7 +692,7 @@
 		msgb_free(msg);
 		return rc;
 	}
-	log_set_context(GPRS_CTX_NSVC, nsvc);
+	log_set_context(LOGGING_CTX_GB_NSVC, nsvc);
 
 	msg->l2h = msgb_push(msg, sizeof(*nsh) + 3);
 	nsh = (struct gprs_ns_hdr *) msg->l2h;
@@ -1099,7 +1099,7 @@
 		struct gprs_nsvc *fallback_nsvc;
 
 		fallback_nsvc = nsi->unknown_nsvc;
-		log_set_context(GPRS_CTX_NSVC, fallback_nsvc);
+		log_set_context(LOGGING_CTX_GB_NSVC, fallback_nsvc);
 		fallback_nsvc->ip.bts_addr = *saddr;
 		fallback_nsvc->ll = ll;
 
@@ -1215,7 +1215,7 @@
 	/* Only the RESET procedure creates a new NSVC */
 	if (nsh->pdu_type != NS_PDUT_RESET) {
 		/* Since we have no NSVC, we have to use a fake */
-		log_set_context(GPRS_CTX_NSVC, fallback_nsvc);
+		log_set_context(LOGGING_CTX_GB_NSVC, fallback_nsvc);
 		LOGP(DNS, LOGL_INFO, "Rejecting NS PDU type 0x%0x "
 		     "from %s for non-existing NS-VC\n",
 		     nsh->pdu_type, gprs_ns_ll_str(fallback_nsvc));
@@ -1256,7 +1256,7 @@
 	if (!existing_nsvc) {
 		*new_nsvc = gprs_nsvc_create(nsi, 0xffff);
 		(*new_nsvc)->nsvci_is_valid = 0;
-		log_set_context(GPRS_CTX_NSVC, *new_nsvc);
+		log_set_context(LOGGING_CTX_GB_NSVC, *new_nsvc);
 		gprs_ns_ll_copy(*new_nsvc, fallback_nsvc);
 		LOGP(DNS, LOGL_INFO, "Creating NS-VC for BSS at %s\n",
 		     gprs_ns_ll_str(fallback_nsvc));
@@ -1299,7 +1299,7 @@
 
 	msgb_nsei(msg) = (*nsvc)->nsei;
 
-	log_set_context(GPRS_CTX_NSVC, *nsvc);
+	log_set_context(LOGGING_CTX_GB_NSVC, *nsvc);
 
 	/* Increment number of Incoming bytes */
 	rate_ctr_inc(&(*nsvc)->ctrg->ctr[NS_CTR_PKTS_IN]);
diff --git a/src/gb/gprs_ns_vty.c b/src/gb/gprs_ns_vty.c
index ee305ba..2026c7a 100644
--- a/src/gb/gprs_ns_vty.c
+++ b/src/gb/gprs_ns_vty.c
@@ -61,11 +61,11 @@
 				struct gprs_nsvc *nsvc)
 {
 	if (nsvc) {
-		target->filter_map |= (1 << FLT_NSVC);
-		target->filter_data[FLT_NSVC] = nsvc;
-	} else if (target->filter_data[FLT_NSVC]) {
-		target->filter_map = ~(1 << FLT_NSVC);
-		target->filter_data[FLT_NSVC] = NULL;
+		target->filter_map |= (1 << LOGGING_FILTER_GB_NSVC);
+		target->filter_data[LOGGING_FILTER_GB_NSVC] = nsvc;
+	} else if (target->filter_data[LOGGING_FILTER_GB_NSVC]) {
+		target->filter_map = ~(1 << LOGGING_FILTER_GB_NSVC);
+		target->filter_data[LOGGING_FILTER_GB_NSVC] = NULL;
 	}
 }
 
diff --git a/src/logging.c b/src/logging.c
index 9b7d6f4..b09d684 100644
--- a/src/logging.c
+++ b/src/logging.c
@@ -48,6 +48,13 @@
 
 #include <osmocom/vty/logging.h>	/* for LOGGING_STR. */
 
+osmo_static_assert(_LOGGING_CTX_COUNT <= ARRAY_SIZE(((struct log_context*)NULL)->ctx),
+		   enum_logging_ctx_items_fit_in_struct_log_context);
+osmo_static_assert(_LOGGING_FILTER_COUNT <= ARRAY_SIZE(((struct log_target*)NULL)->filter_data),
+		   enum_logging_filters_fit_in_log_target_filter_data);
+osmo_static_assert(_LOGGING_FILTER_COUNT <= 8*sizeof(((struct log_target*)NULL)->filter_map),
+		   enum_logging_filters_fit_in_log_target_filter_map);
+
 struct log_info *osmo_log_info;
 
 static struct log_context log_context;
@@ -374,7 +381,7 @@
 	/* Apply filters here... if that becomes messy we will
 	 * need to put filters in a list and each filter will
 	 * say stop, continue, output */
-	if ((tar->filter_map & LOG_FILTER_ALL) != 0)
+	if ((tar->filter_map & (1 << LOGGING_FILTER_ALL)) != 0)
 		return 1;
 
 	if (osmo_log_info->filter_fn)
@@ -492,20 +499,20 @@
 	return 0;
 }
 
-/*! \brief Enable the \ref LOG_FILTER_ALL log filter
+/*! \brief Enable the \ref LOGGING_FILTER_ALL log filter
  *  \param[in] target Log target to be affected
  *  \param[in] all enable (1) or disable (0) the ALL filter
  *
- * When the \ref LOG_FILTER_ALL filter is enabled, all log messages will
- * be printed.  It acts as a wildcard.  Setting it to \a 1 means there
- * is no filtering.
+ * When the \ref LOGGING_FILTER_ALL filter is enabled, all log messages will be
+ * printed.  It acts as a wildcard.  Setting it to \a 1 means there is no
+ * filtering.
  */
 void log_set_all_filter(struct log_target *target, int all)
 {
 	if (all)
-		target->filter_map |= LOG_FILTER_ALL;
+		target->filter_map |= (1 << LOGGING_FILTER_ALL);
 	else
-		target->filter_map &= ~LOG_FILTER_ALL;
+		target->filter_map &= ~(1 << LOGGING_FILTER_ALL);
 }
 
 /*! \brief Enable or disable the use of colored output
diff --git a/src/vty/logging_vty.c b/src/vty/logging_vty.c
index 6004c47..30ee455 100644
--- a/src/vty/logging_vty.c
+++ b/src/vty/logging_vty.c
@@ -287,7 +287,7 @@
 	}
 
 	vty_out(vty, " Log Filter 'ALL': %s%s",
-		tgt->filter_map & LOG_FILTER_ALL ? "Enabled" : "Disabled",
+		tgt->filter_map & (1 << LOGGING_FILTER_ALL) ? "Enabled" : "Disabled",
 		VTY_NEWLINE);
 
 	/* print application specific filters */
@@ -687,7 +687,7 @@
 	}
 
 	vty_out(vty, "  logging filter all %u%s",
-		tgt->filter_map & LOG_FILTER_ALL ? 1 : 0, VTY_NEWLINE);
+		tgt->filter_map & (1 << LOGGING_FILTER_ALL) ? 1 : 0, VTY_NEWLINE);
 	/* save filters outside of libosmocore, i.e. in app code */
 	if (osmo_log_info->save_fn)
 		osmo_log_info->save_fn(vty, osmo_log_info, tgt);