diff --git a/src/misdn.c b/src/misdn.c
new file mode 100644
index 0000000..6b23223
--- /dev/null
+++ b/src/misdn.c
@@ -0,0 +1,281 @@
+/* OpenBSC Abis interface to mISDNuser
+ *
+ * (C) 2008 by Harald Welte <laforge@gnumonks.org>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <mISDNif.h>
+
+#define AF_COMPATIBILITY_FUNC
+#include <compat_af_isdn.h>
+
+#define NUM_E1_TS	32
+
+/* data structure for one E1 interface with A-bis */
+struct mi_e1_handle {
+	struct gsm_bts *bts;
+
+	/* The mISDN card number of the card we use */
+	int cardnr;
+
+	/* The RSL adress */
+	struct sockaddr_mISDN l2addr;
+
+	/* The OML adress */
+	struct sockaddr_mISDN omladdr;
+
+	struct gsm_fd fd[NUM_E1_TS];
+};
+
+#define SAPI_L2ML	0
+#define SAPI_OML	62
+#define SAPI_RSL	63
+
+#define TEI_L2ML	127
+#define TEI_OML		25
+#define TEI_RSL		1
+
+static void hexdump(unsigned char *buf, int len)
+{
+	int i;
+	for (i = 0; i < len; i++) {
+		fprintf(stdout, "%02x ", buf[i]);
+	}
+	fprintf(stdout, "\n");
+}
+
+#define TS1_ALLOC_SIZE	300
+
+static int handle_ts1_read(struct bsc_fd *bfd)
+{
+	struct mi_e1_handle *e1h = bfd->data;
+	struct msgb *msg = msgb_alloc(TS1_ALLOC_SIZE);
+	struct sockaddr_mISDN l2dadr;
+	socklen_t alen;
+
+	if (!msg)
+		return -ENOMEM;
+
+	msg->bts = e1h->bts;
+
+	alen = sizeof(l2addr);
+	ret = recvfrom(bfd->fd, msg->data, 300, 0,
+		       (struct sockaddr *) &l2addr, &alen);
+	if (ret < 0) {
+		fprintf(stderr, "recvfrom error  %s\n", strerror(errno));
+		return ret;
+	}
+
+	if (alen != sizeof(l2addr))
+		return -EINVAL;
+
+	msgb_put(msg, ret);
+
+	DEBUGP(DMI, "alen =%d, dev(%d) channel(%d) sapi(%d) tei(%d)\n",
+		alen, l2addr.dev, l2addr.channel, l2addr.sapi, l2addr.tei);
+
+	DEBUGP(DMI, "<= len = %d, prim(0x%x) id(0x%x)\n",
+		ret, hh->prim, hh->id);
+
+	switch (hh->prim) {
+	case DL_INFORMATION_IND:
+		DEBUGP(DMI, "got DL_INFORMATION_IND\n");
+		struct sockaddr_mISDN *sa;
+		char *lstr = "UNKN";
+
+		switch (l2addr.tei) {
+		case TEI_OML:
+			sa = &e1h->omladdr;
+			lstr = "OML";
+			break;
+		case TEI_RSL:
+			sa = &e1h->l2addr;
+			lstr = "RSL";
+			break;
+		default:
+			continue;
+		}
+		DEBUGP(DMI, "%s use channel(%d) sapi(%d) tei(%d) for now\n",
+			lstr, l2addr.channel, l2addr.sapi, l2addr.tei);
+		memcpy(sa, &l2addr, sizeof(l2addr));
+		break;
+	case DL_ESTABLISH_IND:
+		DEBUGP(DMI, "got DL_ESTABLISH_IND\n");
+		break;
+	case DL_ESTABLISH_CNF:
+		DEBUGP(DMI, "got DL_ESTABLISH_CNF\n");
+		break;
+	case DL_RELEASE_IND:
+		DEBUGP(DMI, "got DL_RELEASE_IND\n");
+		break;
+	case MPH_ACTIVATE_IND:
+		DEBUGP(DMI, "got MPH_ACTIVATE_IND\n");
+		break;
+	case MPH_DEACTIVATE_IND:
+		DEBUGP(DMI, "got MPH_DEACTIVATE_IND\n");
+		break;
+	case DL_DATA_IND:
+		DEBUGP(DMI, "got DL_DATA_IND\n");
+		msg->l2_off = MISDN_HEADER_LEN;
+		hexdump(msgb_l2(msg), ret - MISDN_HEADER_LEN);
+		switch (l2addr.tei) {
+		case TEI_OML:
+			ret = abis_nm_rcvmsg(msg);
+			break;
+		case TEI_RSL:
+			ret = abis_rsl_rcvmsg(msg);
+			break;
+		default:
+			fprintf(stderr, "DATA_IND for unknown TEI\n");
+			break;
+		}
+		break;
+	default:
+		DEBUGP(DMI, "got unexpected 0x%x prim\n", hh->prim);
+		break;
+	}
+	return ret;
+}
+
+static int handle_ts1_write(struct bsc_fd *bfd)
+{
+	struct mi_e1_handle *e1h = bfd->data;
+
+	/* FIXME: dequeue a pending msgb for RSL / OML */
+	
+	/* prepend the mISDNhead */
+	hh = (struct mISDNhed *) msg_
+	hh->prim = DL_DATA_REQ;
+
+	/* FIXME: send it off */
+}
+
+static int handle_tsX_read(struct bsc_fd *bfd)
+{
+	/* FIXME: read from a B channel TS */
+}
+
+static int handle_TsX_write(struct bsc_fd *bfd)
+{
+	/* FIXME: write to a B channel TS */
+}
+
+/* callback from select.c in case one of the fd's can be read/written */
+static int misdn_fd_cb(struct gsm_fd *bfd, unsigned int what)
+{
+	unsigned int e1_ts = bfd->priv_nr;
+	int rc = 0;
+
+	switch (e1_ts) {
+	case 1:
+		if (what & BSC_FD_READ)
+			rc = handle_ts1_read(bfd);
+		if (what & BSC_FD_WRITE)
+			rc = handle_ts1_write(bfd);
+		break;
+	default:
+		if (what & BSC_FD_READ)
+			rc = handle_tsX_read(bfd);
+		if (what & BSC_FD_WRITE)
+			rc = handle_tsX_write(bfd);
+		break;
+	}
+
+	return rc;
+}
+
+static int mi_setup(devinfo_t *di)
+{
+	int ts, sk, ret;
+	struct mISDN_devinfo	devinfo;
+
+	sk = socket(PF_ISDN, SOCK_RAW, ISDN_P_BASE);
+	if (sk < 0)
+		fprintf(stderr, "could not open socket %s\n", strerror(errno));
+		return sk;
+	}
+
+	ret = ioctl(sk, IMGETCOUNT, &cnt);
+	if (ret) {
+		fprintf(stderr, "error getting interf count: %s\n",
+			strerror(errno));
+		close(sk);
+		return -ENODEV;
+	}
+	DEBUGP(DMI,"%d device%s found\n", cnt, (cnt==1)?"":"s");
+#if 0
+	devinfo.id = di->cardnr;
+	ret = ioctl(sk, IMGETDEVINFO, &devinfo);
+	if (ret < 0) {
+		fprintf(stdout, "error getting info for device %d: %s\n",
+			di->cardnr, strerror(errno));
+		return -ENODEV;
+	}
+	fprintf(stdout, "        id:             %d\n", devinfo.id);
+	fprintf(stdout, "        Dprotocols:     %08x\n", devinfo.Dprotocols);
+	fprintf(stdout, "        Bprotocols:     %08x\n", devinfo.Bprotocols);
+	fprintf(stdout, "        protocol:       %d\n", devinfo.protocol);
+	fprintf(stdout, "        nrbchan:        %d\n", devinfo.nrbchan);
+	fprintf(stdout, "        name:           %s\n", devinfo.name);
+#endif
+
+	/* TS0 is CRC4, don't need any fd for it */
+	for (ts = 1; ts < NUM_E1_TS; ts++) {
+		unsigned int idx = i-1;
+		struct bsc_fd *bfd = &e1h->fd[idx];
+		struct sockaddr_mISDN addr;
+
+		if (ts == 1)
+			bfd->fd = socket(PF_ISDN, SOCK_RAW, ISDN_P_LAPD_NT);
+		else
+			bfd->fd = socket(PF_ISDN, SOCK_DGRAM, ISDN_P_B_RAW);
+
+		if (bfd->fd < 0)
+			fprintf(stderr, "could not open socket %s\n",
+				strerror(errno));
+			return bfd->fd;
+		}
+
+		memset(&addr, 0, sizeof(addr));
+		addr.family = AF_ISDN;
+		addr.dev = e1h->cardnr;
+		if (ts == 1) {
+			addr.channel = 0;
+			addr.sapi = 0;/* SAPI not supported yet in kernel */
+			addr.tei = TEI_L2ML;
+		} else
+			addr.channel = ts;
+
+		ret = bind(bfd->fd, (struct sockaddr *) &addr, sizeof(addr));
+		if (ret < 0) {
+			fprintf(stdout, "could not bind l2 socket %s\n",
+				strerror(errno));
+			return -EIO;
+		}
+	}
+}
+