diff --git a/openbsc/src/libbsc/rest_octets.c b/openbsc/src/libbsc/rest_octets.c
index 950e570..a6fdf46 100644
--- a/openbsc/src/libbsc/rest_octets.c
+++ b/openbsc/src/libbsc/rest_octets.c
@@ -379,14 +379,13 @@
 	/* No GPRS_3G_MEASUREMENT Parameters Descr. */
 	bitvec_set_bit(&bv, 0);
 
-	if (&bts->si_common.si2quater_neigh_list) { /* FIXME: use si2q_earfcn_count() in if */
+	if (si2q_earfcn_count(&bts->si_common.si2quater_neigh_list)) {
 		append_earfcn(&bv, bts, SI2Q_MAX_LEN - bv.cur_bit);
 
 		/* FIXME: remove following check once multiple SI2q are properly supported */
 		if ((bts->e_offset != si2q_earfcn_count(&bts->si_common.si2quater_neigh_list)) ||
 		    si2q_earfcn_count(&bts->si_common.si2quater_neigh_list) > 5)
 			return -ENOMEM;
-
 	} else {
 		/* No Additions in Rel-5: */
 		bitvec_set_bit(&bv, L);
diff --git a/openbsc/src/libbsc/system_information.c b/openbsc/src/libbsc/system_information.c
index 0496506..644bebd 100644
--- a/openbsc/src/libbsc/system_information.c
+++ b/openbsc/src/libbsc/system_information.c
@@ -692,6 +692,10 @@
 size_t si2q_earfcn_count(const struct osmo_earfcn_si2q *e)
 {
 	unsigned i, ret = 0;
+
+	if (!e)
+		return 0;
+
 	for (i = 0; i < e->length; i++)
 		if (e->arfcn[i] != OSMO_EARFCN_INVALID)
 			ret++;
@@ -777,7 +781,8 @@
 		si_info.si2ter_indicator = 0;
 	}
 	if ((bts->si_valid & (1 << SYSINFO_TYPE_2quater))) {
-		LOGP(DRR, LOGL_INFO, "SI 2quater is included.\n");
+		LOGP(DRR, LOGL_INFO, "SI 2quater is included, based on %zu EARFCNs and %zu UARFCNs.\n",
+		     si2q_earfcn_count(&bts->si_common.si2quater_neigh_list), bts->si_common.uarfcn_length);
 		si_info.si2quater_indicator = 1;
 	} else {
 		si_info.si2quater_indicator = 0;
diff --git a/openbsc/tests/gsm0408/gsm0408_test.c b/openbsc/tests/gsm0408/gsm0408_test.c
index 265e4b2..36f6993 100644
--- a/openbsc/tests/gsm0408/gsm0408_test.c
+++ b/openbsc/tests/gsm0408/gsm0408_test.c
@@ -28,6 +28,7 @@
 #include <openbsc/gsm_04_08.h>
 #include <openbsc/gsm_04_11.h>
 #include <openbsc/gsm_subscriber.h>
+#include <openbsc/gsm_data_shared.h>
 #include <openbsc/debug.h>
 #include <openbsc/arfcn_range_encode.h>
 #include <openbsc/system_information.h>
@@ -86,23 +87,43 @@
 
 static inline void gen(struct gsm_bts *bts, const char *s)
 {
+	int r;
+
 	bts->u_offset = 0;
 	bts->e_offset = 0;
 	bts->si2q_index = 0;
 	bts->si2q_count = 0;
 	bts->si_valid = 0;
 	bts->si_valid |= (1 << SYSINFO_TYPE_2quater);
+
 	/* should be no-op as entire buffer is filled with padding: */
 	memset(GSM_BTS_SI(bts, SYSINFO_TYPE_2quater), 0xAE, GSM_MACBLOCK_LEN);
-	int r = gsm_generate_si(bts, SYSINFO_TYPE_2quater);
-	bool v = bts->si_valid & (1 << SYSINFO_TYPE_2quater);
+
+	printf("generating SI2quater for %zu EARFCNs and %zu UARFCNs...\n",
+	       si2q_earfcn_count(&bts->si_common.si2quater_neigh_list), bts->si_common.uarfcn_length);
+
+	r = gsm_generate_si(bts, SYSINFO_TYPE_2quater);
 	if (r > 0)
-		printf("generated %s SI2quater: [%d] %s\n",
-		       v ? "valid" : "invalid", r, osmo_hexdump(GSM_BTS_SI(bts, SYSINFO_TYPE_2quater), r));
+		printf("generated %s SI2quater [%02u/%02u]: [%d] %s\n",
+		       (bts->si_valid & (1 << SYSINFO_TYPE_2quater)) ? "valid" : "invalid",
+		       bts->si2q_index, bts->si2q_count, r,
+		       osmo_hexdump((void *)GSM_BTS_SI2Q(bts), GSM_MACBLOCK_LEN));
 	else
 		printf("%s() failed to generate SI2quater: %s\n", s, strerror(-r));
 }
 
+static inline void del_earfcn_b(struct gsm_bts *bts, uint16_t earfcn)
+{
+	struct osmo_earfcn_si2q *e = &bts->si_common.si2quater_neigh_list;
+	int r = osmo_earfcn_del(e, earfcn);
+	if (r)
+		printf("failed to remove EARFCN %u: %s\n", earfcn, strerror(-r));
+	else
+		printf("removed EARFCN %u - ", earfcn);
+
+	gen(bts, __func__);
+}
+
 static inline void add_earfcn_b(struct gsm_bts *bts, uint16_t earfcn, uint8_t bw)
 {
 	struct osmo_earfcn_si2q *e = &bts->si_common.si2quater_neigh_list;
@@ -208,7 +229,9 @@
 	osmo_earfcn_init(&bts->si_common.si2quater_neigh_list);
 	/* first generate invalid SI as no EARFCN added */
 	gen(bts, __func__);
-	/* subsequent calls should produce valid SI if there's enough memory */
+	/* subsequent calls should produce valid SI if there's enough memory and EARFCNs */
+	add_earfcn_b(bts, 1917, 5);
+	del_earfcn_b(bts, 1917);
 	add_earfcn_b(bts, 1917, 1);
 	add_earfcn_b(bts, 1932, OSMO_EARFCN_MEAS_INVALID);
 	add_earfcn_b(bts, 1937, 2);
diff --git a/openbsc/tests/gsm0408/gsm0408_test.ok b/openbsc/tests/gsm0408/gsm0408_test.ok
index 5f9398b..5e0b9d5 100644
--- a/openbsc/tests/gsm0408/gsm0408_test.ok
+++ b/openbsc/tests/gsm0408/gsm0408_test.ok
@@ -63,39 +63,70 @@
 Allocated reference: 0
 Allocated reference: 1
 Test SI2quater UARFCN (same scrambling code and diversity):
-generated valid SI2quater: [23] 59 06 07 c0 00 25 52 88 0a 7e 10 99 64 00 0b 2b 2b 2b 2b 2b 2b 2b 2b 
-generated valid SI2quater: [23] 59 06 07 c0 00 25 52 e8 0a 7f 52 88 0a 7e 10 99 64 00 0b 2b 2b 2b 2b 
-generated valid SI2quater: [23] 59 06 07 c0 00 25 52 e8 0a 7f 52 88 0a 7e 10 99 64 00 0b 2b 2b 2b 2b 
+generating SI2quater for 0 EARFCNs and 1 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 25 52 88 0a 7e 0b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 
+generating SI2quater for 0 EARFCNs and 2 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 25 52 e8 0a 7f 52 88 0a 7e 0b 2b 2b 2b 2b 2b 2b 2b 2b 
+generating SI2quater for 0 EARFCNs and 2 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 25 52 e8 0a 7f 52 88 0a 7e 0b 2b 2b 2b 2b 2b 2b 2b 2b 
 Testing SYSINFO_TYPE_2quater EARFCN generation:
-generated invalid SI2quater: [23] ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae 
-added EARFCN 1917 - generated valid SI2quater: [23] 59 06 07 c0 00 04 86 59 83 be c8 50 0b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 
-added EARFCN 1932 - generated valid SI2quater: [23] 59 06 07 c0 00 04 86 59 83 be cc 1e 30 14 03 2b 2b 2b 2b 2b 2b 2b 2b 
-added EARFCN 1937 - generated valid SI2quater: [23] 59 06 07 c0 00 04 86 59 83 be cc 1e 31 07 91 a0 a0 2b 2b 2b 2b 2b 2b 
-added EARFCN 1945 - generated valid SI2quater: [23] 59 06 07 c0 00 04 86 59 83 be cc 1e 31 07 91 a8 3c c8 28 0b 2b 2b 2b 
-added EARFCN 1965 - generated valid SI2quater: [23] 59 06 07 c0 00 04 86 59 83 be cc 1e 31 07 91 a8 3c ca 0f 5a 0a 03 2b 
-added EARFCN 1967 - add_earfcn_b() failed to generate SI2quater: Cannot allocate memory
-added EARFCN 1982 - add_earfcn_b() failed to generate SI2quater: Cannot allocate memory
+generating SI2quater for 0 EARFCNs and 0 UARFCNs...
+generated invalid SI2quater [00/00]: [23] ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae 
+added EARFCN 1917 - generating SI2quater for 1 EARFCNs and 0 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 04 86 59 83 be e8 50 0b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 
+removed EARFCN 1917 - generating SI2quater for 0 EARFCNs and 0 UARFCNs...
+generated invalid SI2quater [00/00]: [23] ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae 
+added EARFCN 1917 - generating SI2quater for 1 EARFCNs and 0 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 04 86 59 83 be c8 50 0b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 
+added EARFCN 1932 - generating SI2quater for 2 EARFCNs and 0 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 04 86 59 83 be cc 1e 30 14 03 2b 2b 2b 2b 2b 2b 2b 2b 
+added EARFCN 1937 - generating SI2quater for 3 EARFCNs and 0 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 04 86 59 83 be cc 1e 31 07 91 a0 a0 2b 2b 2b 2b 2b 2b 
+added EARFCN 1945 - generating SI2quater for 4 EARFCNs and 0 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 04 86 59 83 be cc 1e 31 07 91 a8 3c c8 28 0b 2b 2b 2b 
+added EARFCN 1965 - generating SI2quater for 5 EARFCNs and 0 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 04 86 59 83 be cc 1e 31 07 91 a8 3c ca 0f 5a 0a 03 2b 
+added EARFCN 1967 - generating SI2quater for 6 EARFCNs and 0 UARFCNs...
+add_earfcn_b() failed to generate SI2quater: Cannot allocate memory
+added EARFCN 1982 - generating SI2quater for 7 EARFCNs and 0 UARFCNs...
+add_earfcn_b() failed to generate SI2quater: Cannot allocate memory
 Testing SYSINFO_TYPE_2quater UARFCN generation:
-generated invalid SI2quater: [23] ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae 
-generated valid SI2quater: [23] 59 06 07 c0 00 25 0f 7c 0c 1a 10 99 64 00 0b 2b 2b 2b 2b 2b 2b 2b 2b 
-generated valid SI2quater: [23] 59 06 07 c0 00 25 0f 7c 14 1a 1f 00 44 b2 00 03 2b 2b 2b 2b 2b 2b 2b 
-generated valid SI2quater: [23] 59 06 07 c0 00 25 0f 7c 18 58 12 f0 84 86 59 00 03 2b 2b 2b 2b 2b 2b 
-generated valid SI2quater: [23] 59 06 07 c0 00 25 0f 7c 20 58 2e f0 f2 04 86 59 00 03 2b 2b 2b 2b 2b 
-generated valid SI2quater: [23] 59 06 07 c0 00 25 0f 7c 28 58 2e 22 f2 4e 84 86 59 00 03 2b 2b 2b 2b 
-generated valid SI2quater: [23] 59 06 07 c0 00 25 0f 7c 34 1a 64 26 5d f2 05 04 86 59 00 03 2b 2b 2b 
-generated valid SI2quater: [23] 59 06 07 c0 00 25 0f 7c 38 58 12 22 fd ce 8e 05 04 86 59 00 03 2b 2b 
-generated valid SI2quater: [23] 59 06 07 c0 00 25 0f 7c 40 58 1d 22 fa ce 88 85 7b 00 44 b2 00 03 2b 
-generated valid SI2quater: [23] 59 06 07 c0 00 25 0f 7c 4c 7a 34 0e 64 77 85 43 55 c8 10 99 64 00 0b 
+generating SI2quater for 0 EARFCNs and 0 UARFCNs...
+generated invalid SI2quater [00/00]: [23] ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae ae 
+generating SI2quater for 0 EARFCNs and 1 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 25 0f 7c 0c 1a 0b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 
+generating SI2quater for 0 EARFCNs and 2 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 25 0f 7c 14 1a 1f 0b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 
+generating SI2quater for 0 EARFCNs and 3 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 25 0f 7c 18 58 12 f0 83 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 
+generating SI2quater for 0 EARFCNs and 4 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 25 0f 7c 20 58 2e f0 f2 03 2b 2b 2b 2b 2b 2b 2b 2b 2b 
+generating SI2quater for 0 EARFCNs and 5 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 25 0f 7c 28 58 2e 22 f2 4e 83 2b 2b 2b 2b 2b 2b 2b 2b 
+generating SI2quater for 0 EARFCNs and 6 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 25 0f 7c 34 1a 64 26 5d f2 05 03 2b 2b 2b 2b 2b 2b 2b 
+generating SI2quater for 0 EARFCNs and 7 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 25 0f 7c 38 58 12 22 fd ce 8e 05 03 2b 2b 2b 2b 2b 2b 
+generating SI2quater for 0 EARFCNs and 8 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 25 0f 7c 40 58 1d 22 fa ce 88 85 7b 0b 2b 2b 2b 2b 2b 
+generating SI2quater for 0 EARFCNs and 9 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 25 0f 7c 4c 7a 34 0e 64 77 85 43 55 c8 0b 2b 2b 2b 2b 
 failed to add UARFCN to SI2quater: No space left on device
 failed to add UARFCN to SI2quater: No space left on device
-generated valid SI2quater: [23] 59 06 07 c0 00 25 0f 7c 4c 7a 34 0e 64 77 85 43 55 c8 10 99 64 00 0b 
+generating SI2quater for 0 EARFCNs and 9 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 25 0f 7c 4c 7a 34 0e 64 77 85 43 55 c8 0b 2b 2b 2b 2b 
 Test SI2quater multiple UARFCNs:
-generated valid SI2quater: [23] 59 06 07 c0 00 25 52 88 0a 7c 10 99 64 00 0b 2b 2b 2b 2b 2b 2b 2b 2b 
-generated valid SI2quater: [23] 59 06 07 c0 00 25 52 e8 0a 7f 52 88 0a 7c 10 99 64 00 0b 2b 2b 2b 2b 
-generated valid SI2quater: [23] 59 06 07 c0 00 25 52 e8 12 7e e0 a9 44 05 3e 00 44 b2 00 03 2b 2b 2b 
-generated valid SI2quater: [23] 59 06 07 c0 00 25 52 e8 18 3f f4 90 54 a2 02 9f 04 86 59 00 03 2b 2b 
+generating SI2quater for 0 EARFCNs and 1 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 25 52 88 0a 7c 0b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 
+generating SI2quater for 0 EARFCNs and 2 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 25 52 e8 0a 7f 52 88 0a 7c 0b 2b 2b 2b 2b 2b 2b 2b 2b 
+generating SI2quater for 0 EARFCNs and 3 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 25 52 e8 12 7e e0 a9 44 05 3e 0b 2b 2b 2b 2b 2b 2b 2b 
+generating SI2quater for 0 EARFCNs and 4 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 25 52 e8 18 3f f4 90 54 a2 02 9f 03 2b 2b 2b 2b 2b 2b 
 failed to add UARFCN to SI2quater: No space left on device
 failed to add UARFCN to SI2quater: No space left on device
 failed to add UARFCN to SI2quater: No space left on device
-generated valid SI2quater: [23] 59 06 07 c0 00 25 52 e8 18 3f f4 90 54 a2 02 9f 04 86 59 00 03 2b 2b 
+generating SI2quater for 0 EARFCNs and 4 UARFCNs...
+generated valid SI2quater [00/00]: [23] 59 06 07 c0 00 25 52 e8 18 3f f4 90 54 a2 02 9f 03 2b 2b 2b 2b 2b 2b 
 Done.