diff --git a/subsys/bluetooth/controller/CMakeLists.txt b/subsys/bluetooth/controller/CMakeLists.txt
index 6606ec9cb07..529f762ff06 100644
--- a/subsys/bluetooth/controller/CMakeLists.txt
+++ b/subsys/bluetooth/controller/CMakeLists.txt
@@ -90,6 +90,12 @@ if(CONFIG_BT_LL_SW_SPLIT)
       )
   endif()
 
+  if(CONFIG_BT_CTLR_PERIPHERAL_ISO OR
+     CONFIG_BT_CTLR_CENTRAL_ISO)
+    zephyr_library_sources(
+      ll_sw/ull_conn_iso.c
+      )
+  endif()
   if(CONFIG_BT_CTLR_ADV_ISO OR
      CONFIG_BT_CTLR_SYNC_ISO OR
      CONFIG_BT_CTLR_PERIPHERAL_ISO OR
diff --git a/subsys/bluetooth/controller/ll_sw/ull.c b/subsys/bluetooth/controller/ll_sw/ull.c
index d58790ff322..ca0c809489f 100644
--- a/subsys/bluetooth/controller/ll_sw/ull.c
+++ b/subsys/bluetooth/controller/ll_sw/ull.c
@@ -52,6 +52,9 @@
 #include "ull_sync_internal.h"
 #include "ull_sync_iso_internal.h"
 #include "ull_conn_internal.h"
+#include "ull_conn_iso_internal.h"
+#include "ull_central_iso_internal.h"
+#include "ull_peripheral_iso_internal.h"
 #include "ull_df.h"
 
 #if defined(CONFIG_BT_CTLR_USER_EXT)
@@ -459,12 +462,34 @@ int ll_init(struct k_sem *sem_rx)
 	* CONFIG_BT_CTLR_PERIPHERAL_ISO || CONFIG_BT_CTLR_CENTRAL_ISO
 	*/
 
+#if defined(CONFIG_BT_CTLR_PERIPHERAL_ISO) || \
+	defined(CONFIG_BT_CTLR_CENTRAL_ISO)
+	err = ull_conn_iso_init();
+	if (err) {
+		return err;
+	}
+#endif /* CONFIG_BT_CTLR_PERIPHERAL_ISO || CONFIG_BT_CTLR_CENTRAL_ISO */
+
+#if defined(CONFIG_BT_CTLR_PERIPHERAL_ISO)
+	err = ull_peripheral_iso_init();
+	if (err) {
+		return err;
+	}
+#endif /* CONFIG_BT_CTLR_PERIPHERAL_ISO */
+
+#if defined(CONFIG_BT_CTLR_CENTRAL_ISO)
+	err = ull_central_iso_init();
+	if (err) {
+		return err;
+	}
+#endif /* CONFIG_BT_CTLR_CENTRAL_ISO */
+
 #if defined(CONFIG_BT_CTLR_ADV_ISO)
 	err = ull_adv_iso_init();
 	if (err) {
 		return err;
 	}
-#endif /* CONFIG_BT_CONN */
+#endif /* CONFIG_BT_CTLR_ADV_ISO */
 
 #if IS_ENABLED(CONFIG_BT_CTLR_DF)
 	err = lll_df_init();
@@ -535,11 +560,27 @@ void ll_reset(void)
 	* CONFIG_BT_CTLR_PERIPHERAL_ISO || CONFIG_BT_CTLR_CENTRAL_ISO
 	*/
 
+#if defined(CONFIG_BT_CTLR_PERIPHERAL_ISO) || \
+	defined(CONFIG_BT_CTLR_CENTRAL_ISO)
+	err = ull_conn_iso_reset();
+	LL_ASSERT(!err);
+#endif /* CONFIG_BT_CTLR_PERIPHERAL_ISO || CONFIG_BT_CTLR_CENTRAL_ISO */
+
+#if defined(CONFIG_BT_CTLR_PERIPHERAL_ISO)
+	err = ull_peripheral_iso_reset();
+	LL_ASSERT(!err);
+#endif /* CONFIG_BT_CTLR_PERIPHERAL_ISO */
+
+#if defined(CONFIG_BT_CTLR_CENTRAL_ISO)
+	err = ull_central_iso_reset();
+	LL_ASSERT(!err);
+#endif /* CONFIG_BT_CTLR_CENTRAL_ISO */
+
 #if defined(CONFIG_BT_CTLR_ADV_ISO)
 	/* Reset periodic sync sets */
 	err = ull_adv_iso_reset();
 	LL_ASSERT(!err);
-#endif /* CONFIG_BT_CTLR_SYNC_PERIODIC */
+#endif /* CONFIG_BT_CTLR_ADV_ISO */
 
 #if IS_ENABLED(CONFIG_BT_CTLR_DF)
 	err = ull_df_reset();
diff --git a/subsys/bluetooth/controller/ll_sw/ull_central_iso.c b/subsys/bluetooth/controller/ll_sw/ull_central_iso.c
index de16efc0ef3..d46d3beb183 100644
--- a/subsys/bluetooth/controller/ll_sw/ull_central_iso.c
+++ b/subsys/bluetooth/controller/ll_sw/ull_central_iso.c
@@ -122,3 +122,13 @@ void ll_cis_create(uint16_t cis_handle, uint16_t acl_handle)
 	ARG_UNUSED(cis_handle);
 	ARG_UNUSED(acl_handle);
 }
+
+int ull_central_iso_init(void)
+{
+	return 0;
+}
+
+int ull_central_iso_reset(void)
+{
+	return 0;
+}
diff --git a/subsys/bluetooth/controller/ll_sw/ull_central_iso_internal.h b/subsys/bluetooth/controller/ll_sw/ull_central_iso_internal.h
new file mode 100644
index 00000000000..ea8a2e2f8ee
--- /dev/null
+++ b/subsys/bluetooth/controller/ll_sw/ull_central_iso_internal.h
@@ -0,0 +1,9 @@
+/*
+ * Copyright (c) 2021 Demant
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/* Helper functions to initialize and reset ull_central_iso module */
+int ull_central_iso_init(void);
+int ull_central_iso_reset(void);
diff --git a/subsys/bluetooth/controller/ll_sw/ull_conn_iso.c b/subsys/bluetooth/controller/ll_sw/ull_conn_iso.c
new file mode 100644
index 00000000000..89c23c05672
--- /dev/null
+++ b/subsys/bluetooth/controller/ll_sw/ull_conn_iso.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2021 Demant
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr.h>
+
+#include "util/mem.h"
+#include "util/memq.h"
+
+#include "lll.h"
+#include "lll_conn_iso.h"
+#include "ull_conn_iso_types.h"
+
+#define BT_DBG_ENABLED IS_ENABLED(CONFIG_BT_DEBUG_HCI_DRIVER)
+#define LOG_MODULE_NAME bt_ctlr_ull_conn_iso
+#include "common/log.h"
+#include "hal/debug.h"
+
+static struct ll_conn_iso_stream cis_pool[CONFIG_BT_CTLR_CONN_ISO_STREAMS];
+static void *cis_free;
+
+static struct ll_conn_iso_group cig_pool[CONFIG_BT_CTLR_CONN_ISO_GROUPS];
+static void *cig_free;
+
+static int init_reset(void);
+
+int ull_conn_iso_init(void)
+{
+	return init_reset();
+}
+
+int ull_conn_iso_reset(void)
+{
+	return init_reset();
+}
+
+static int init_reset(void)
+{
+	/* Initialize CIS pool */
+	mem_init(cis_pool, sizeof(struct ll_conn_iso_stream),
+		 sizeof(cis_pool) / sizeof(struct ll_conn_iso_stream),
+		 &cis_free);
+
+	/* Initialize CIG pool */
+	mem_init(cig_pool, sizeof(struct ll_conn_iso_group),
+		 sizeof(cig_pool) / sizeof(struct ll_conn_iso_group),
+		 &cig_free);
+
+	return 0;
+}
diff --git a/subsys/bluetooth/controller/ll_sw/ull_conn_iso_internal.h b/subsys/bluetooth/controller/ll_sw/ull_conn_iso_internal.h
new file mode 100644
index 00000000000..8c1d88c12e6
--- /dev/null
+++ b/subsys/bluetooth/controller/ll_sw/ull_conn_iso_internal.h
@@ -0,0 +1,9 @@
+/*
+ * Copyright (c) 2021 Demant
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/* Helper functions to initialize and reset ull_conn_iso module */
+int ull_conn_iso_init(void);
+int ull_conn_iso_reset(void);
diff --git a/subsys/bluetooth/controller/ll_sw/ull_peripheral_iso.c b/subsys/bluetooth/controller/ll_sw/ull_peripheral_iso.c
index 563792f2c0e..8507ad6bea2 100644
--- a/subsys/bluetooth/controller/ll_sw/ull_peripheral_iso.c
+++ b/subsys/bluetooth/controller/ll_sw/ull_peripheral_iso.c
@@ -25,3 +25,13 @@ uint8_t ll_cis_reject(uint16_t handle, uint8_t reason)
 
 	return BT_HCI_ERR_CMD_DISALLOWED;
 }
+
+int ull_peripheral_iso_init(void)
+{
+	return 0;
+}
+
+int ull_peripheral_iso_reset(void)
+{
+	return 0;
+}
diff --git a/subsys/bluetooth/controller/ll_sw/ull_peripheral_iso_internal.h b/subsys/bluetooth/controller/ll_sw/ull_peripheral_iso_internal.h
new file mode 100644
index 00000000000..8df591e9620
--- /dev/null
+++ b/subsys/bluetooth/controller/ll_sw/ull_peripheral_iso_internal.h
@@ -0,0 +1,9 @@
+/*
+ * Copyright (c) 2021 Demant
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/* Helper functions to initialize and reset ull_peripheral_iso module */
+int ull_peripheral_iso_init(void);
+int ull_peripheral_iso_reset(void);