diff --git a/net/bluetooth/l2cap_br.c b/net/bluetooth/l2cap_br.c
index 512eed1b279..55621cee59b 100644
--- a/net/bluetooth/l2cap_br.c
+++ b/net/bluetooth/l2cap_br.c
@@ -386,7 +386,7 @@ int bt_l2cap_br_server_register(struct bt_l2cap_server *server)
 }
 
 static void l2cap_br_send_reject(struct bt_conn *conn, uint8_t ident,
-				 uint16_t reason)
+				 uint16_t reason, void *data, uint8_t data_len)
 {
 	struct bt_l2cap_cmd_reject *rej;
 	struct bt_l2cap_sig_hdr *hdr;
@@ -400,11 +400,20 @@ static void l2cap_br_send_reject(struct bt_conn *conn, uint8_t ident,
 	hdr = net_buf_add(buf, sizeof(*hdr));
 	hdr->code = BT_L2CAP_CMD_REJECT;
 	hdr->ident = ident;
-	hdr->len = sys_cpu_to_le16(sizeof(*rej));
+	hdr->len = sys_cpu_to_le16(sizeof(*rej) + data_len);
 
 	rej = net_buf_add(buf, sizeof(*rej));
 	rej->reason = sys_cpu_to_le16(reason);
 
+	/*
+	 * optional data if available must be already in little-endian format
+	 * made by caller.and be compliant with Core 4.2 [Vol 3, Part A, 4.1,
+	 * table 4.4]
+	 */
+	if (data) {
+		memcpy(net_buf_add(buf, data_len), data, data_len);
+	}
+
 	bt_l2cap_send(conn, BT_L2CAP_CID_BR_SIG, buf);
 }
 
@@ -472,7 +481,12 @@ static void l2cap_br_disconn_req(struct bt_l2cap_br *l2cap, uint8_t ident,
 
 	chan = l2cap_br_remove_tx_cid(conn, scid);
 	if (!chan) {
-		l2cap_br_send_reject(conn, ident, BT_L2CAP_REJ_INVALID_CID);
+		struct bt_l2cap_cmd_reject_cid_data data;
+
+		data.scid = req->scid;
+		data.dcid = req->dcid;
+		l2cap_br_send_reject(conn, ident, BT_L2CAP_REJ_INVALID_CID,
+				     &data, sizeof(data));
 		return;
 	}
 
@@ -545,7 +559,7 @@ static void l2cap_br_recv(struct bt_l2cap_chan *chan, struct net_buf *buf)
 	default:
 		BT_WARN("Unknown/Unsupported L2CAP PDU code 0x%02x", hdr->code);
 		l2cap_br_send_reject(chan->conn, hdr->ident,
-				     BT_L2CAP_REJ_NOT_UNDERSTOOD);
+				     BT_L2CAP_REJ_NOT_UNDERSTOOD, NULL, 0);
 		break;
 	}
 }