diff --git a/openbsc/src/libbsc/rest_octets.c b/openbsc/src/libbsc/rest_octets.c
index aa286e5..065fb7b 100644
--- a/openbsc/src/libbsc/rest_octets.c
+++ b/openbsc/src/libbsc/rest_octets.c
@@ -450,6 +450,45 @@
 	return bv.data_len;
 }
 
+
+/* GSM 04.18 ETSI TS 101 503 V8.27.0 (2006-05)
+
+<SI6 rest octets> ::=
+{L | H <PCH and NCH info>}
+{L | H <VBS/VGCS options : bit(2)>}
+{ < DTM_support : bit == L > I < DTM_support : bit == H >
+< RAC : bit (8) >
+< MAX_LAPDm : bit (3) > }
+< Band indicator >
+{ L | H < GPRS_MS_TXPWR_MAX_CCH : bit (5) > }
+<implicit spare >;
+*/
+int rest_octets_si6(uint8_t *data, bool is1800_net)
+{
+	struct bitvec bv;
+
+	memset(&bv, 0, sizeof(bv));
+	bv.data = data;
+	bv.data_len = 1;
+
+	/* no PCH/NCH info */
+	bitvec_set_bit(&bv, L);
+	/* no VBS/VGCS options */
+	bitvec_set_bit(&bv, L);
+	/* no DTM_support */
+	bitvec_set_bit(&bv, L);
+	/* band indicator */
+	if (is1800_net)
+		bitvec_set_bit(&bv, L);
+	else
+		bitvec_set_bit(&bv, H);
+	/* no GPRS_MS_TXPWR_MAX_CCH */
+	bitvec_set_bit(&bv, L);
+
+	bitvec_spare_padding(&bv, (bv.data_len * 8) - 1);
+	return bv.data_len;
+}
+
 /* GPRS Mobile Allocation as per TS 04.60 Chapter 12.10a:
    < GPRS Mobile Allocation IE > ::=
      < HSN : bit (6) >
diff --git a/openbsc/src/libbsc/system_information.c b/openbsc/src/libbsc/system_information.c
index bf20394..d40bbaf 100644
--- a/openbsc/src/libbsc/system_information.c
+++ b/openbsc/src/libbsc/system_information.c
@@ -905,6 +905,7 @@
 {
 	struct gsm48_system_information_type_6 *si6;
 	int l2_plen = 11;
+	int rc;
 
 	memset(output, GSM_MACBLOCK_PADDING, GSM_MACBLOCK_LEN);
 
@@ -935,8 +936,9 @@
 	gsm48_set_dtx(&si6->cell_options, bts->dtxu, bts->dtxu, false);
 
 	/* SI6 Rest Octets: 10.5.2.35a: PCH / NCH info, VBS/VGCS options */
+	rc = rest_octets_si6(si6->rest_octets, is_dcs_net(bts));
 
-	return l2_plen;
+	return l2_plen + rc;
 }
 
 static struct gsm48_si13_info si13_default = {