diff --git a/openbsc/include/openbsc/abis_om2000.h b/openbsc/include/openbsc/abis_om2000.h
index e4f19cf..be369fe 100644
--- a/openbsc/include/openbsc/abis_om2000.h
+++ b/openbsc/include/openbsc/abis_om2000.h
@@ -41,12 +41,21 @@
 	uint8_t inst;
 } __attribute__ ((packed));
 
+/* on-wire format for IS conn group */
 struct om2k_is_conn_grp {
 	uint16_t icp1;
 	uint16_t icp2;
 	uint8_t cont_idx;
 } __attribute__ ((packed));
 
+/* internal data formant for IS conn group */
+struct is_conn_group {
+	struct llist_head list;
+	uint16_t icp1;
+	uint16_t icp2;
+	uint8_t ci;
+};
+
 extern const struct value_string om2k_mo_class_short_vals[];
 
 int abis_om2k_rcvmsg(struct msgb *msg);
@@ -63,8 +72,7 @@
 int abis_om2k_tx_test_req(struct gsm_bts *bts, const struct abis_om2k_mo *mo);
 int abis_om2k_tx_op_info(struct gsm_bts *bts, const struct abis_om2k_mo *mo,
 			 uint8_t operational);
-int abis_om2k_tx_is_conf_req(struct gsm_bts *bts, struct om2k_is_conn_grp *cg,
-			     unsigned int num_cg);
+int abis_om2k_tx_is_conf_req(struct gsm_bts *bts);
 int abis_om2k_tx_tf_conf_req(struct gsm_bts *bts);
 int abis_om2k_tx_rx_conf_req(struct gsm_bts_trx *trx);
 int abis_om2k_tx_tx_conf_req(struct gsm_bts_trx *trx);
diff --git a/openbsc/src/libbsc/abis_om2000.c b/openbsc/src/libbsc/abis_om2000.c
index 00fc60a..41e30c0 100644
--- a/openbsc/src/libbsc/abis_om2000.c
+++ b/openbsc/src/libbsc/abis_om2000.c
@@ -954,11 +954,35 @@
 	return abis_om2k_sendmsg(bts, msg);
 }
 
-int abis_om2k_tx_is_conf_req(struct gsm_bts *bts, struct om2k_is_conn_grp *cg,
-			     unsigned int num_cg )
+static void om2k_fill_is_conn_grp(struct om2k_is_conn_grp *grp, uint16_t icp1,
+				  uint16_t icp2, uint8_t cont_idx)
+{
+	grp->icp1 = htons(icp1);
+	grp->icp2 = htons(icp2);
+	grp->cont_idx = cont_idx;
+}
+
+int abis_om2k_tx_is_conf_req(struct gsm_bts *bts)
 {
 	struct msgb *msg = om2k_msgb_alloc();
 	struct abis_om2k_hdr *o2k;
+	struct is_conn_group *grp;
+	unsigned int num_grps = 0, i = 0;
+	struct om2k_is_conn_grp *cg;
+
+	/* count number of groups in linked list */
+	llist_for_each_entry(grp, &bts->rbs2000.is.conn_groups, list)
+		num_grps++;
+
+	if (!num_grps)
+		return -EINVAL;
+
+	/* allocate buffer for oml group array */
+	cg = talloc_zero_array(bts, struct om2k_is_conn_grp, num_grps);
+
+	/* fill array with data from linked list */
+	llist_for_each_entry(grp, &bts->rbs2000.is.conn_groups, list)
+		om2k_fill_is_conn_grp(&cg[i++], grp->icp1, grp->icp2, grp->ci);
 
 	o2k = (struct abis_om2k_hdr *) msgb_put(msg, sizeof(*o2k));
 	fill_om2k_hdr(o2k, &om2k_mo_is, OM2K_MSGT_IS_CONF_REQ);
@@ -967,7 +991,9 @@
 	msgb_tv_put(msg, OM2K_DEI_END_LIST_NR, 1);
 
 	msgb_tlv_put(msg, OM2K_DEI_IS_CONN_LIST,
-		     num_cg * sizeof(*cg), (uint8_t *)cg);
+		     num_grps * sizeof(*cg), (uint8_t *)cg);
+
+	talloc_free(cg);
 
 	return abis_om2k_sendmsg(bts, msg);
 }
diff --git a/openbsc/src/libbsc/abis_om2000_vty.c b/openbsc/src/libbsc/abis_om2000_vty.c
index 95f765e..cce4eb3 100644
--- a/openbsc/src/libbsc/abis_om2000_vty.c
+++ b/openbsc/src/libbsc/abis_om2000_vty.c
@@ -324,21 +324,6 @@
 	return CMD_SUCCESS;
 }
 
-static void om2k_fill_is_conn_grp(struct om2k_is_conn_grp *grp, uint16_t icp1,
-				  uint16_t icp2, uint8_t cont_idx)
-{
-	grp->icp1 = htons(icp1);
-	grp->icp2 = htons(icp2);
-	grp->cont_idx = cont_idx;
-}
-
-struct is_conn_group {
-	struct llist_head list;
-	uint16_t icp1;
-	uint16_t icp2;
-	uint8_t ci;
-};
-
 DEFUN(cfg_bts_is_conn_list, cfg_bts_is_conn_list_cmd,
 	"is-connection-list (add|del) <0-2047> <0-2047> <0-255>",
 	"Interface Switch Connnection List\n"
@@ -375,37 +360,6 @@
 }
 
 
-static int is_conf_req(struct gsm_bts *bts, struct vty *vty)
-{
-	struct is_conn_group *grp;
-	unsigned int num_grps = 0, i = 0;
-	struct om2k_is_conn_grp *o2grps;
-
-	/* count number of groups in linked list */
-	llist_for_each_entry(grp, &bts->rbs2000.is.conn_groups, list)
-		num_grps++;
-
-	if (!num_grps) {
-		vty_out(vty, "%% No IS connection groups configured!%s",
-			VTY_NEWLINE);
-		return CMD_WARNING;
-	}
-
-	/* allocate buffer for oml group array */
-	o2grps = talloc_zero_array(bts, struct om2k_is_conn_grp, num_grps);
-
-	/* fill array with data from linked list */
-	llist_for_each_entry(grp, &bts->rbs2000.is.conn_groups, list)
-		om2k_fill_is_conn_grp(&o2grps[i++], grp->icp1, grp->icp2, grp->ci);
-
-	/* send the actual OML request */
-	abis_om2k_tx_is_conf_req(bts, o2grps, num_grps);
-
-	talloc_free(o2grps);
-
-	return CMD_SUCCESS;
-}
-
 DEFUN(om2k_conf_req, om2k_conf_req_cmd,
 	"configuration-request",
 	"Send the configuration request for current MO\n")
@@ -417,7 +371,7 @@
 
 	switch (oms->mo.class) {
 	case OM2K_MO_CLS_IS:
-		return is_conf_req(bts, vty);
+		abis_om2k_tx_is_conf_req(bts);
 		break;
 	case OM2K_MO_CLS_TS:
 		trx = gsm_bts_trx_by_nr(bts, oms->mo.assoc_so);