diff --git a/include/openbsc/gsm_data.h b/include/openbsc/gsm_data.h
index d9974a7..986f331 100644
--- a/include/openbsc/gsm_data.h
+++ b/include/openbsc/gsm_data.h
@@ -13,6 +13,18 @@
 
 #define HARDCODED_ARFCN 123
 
+/*
+ * Use the channel. As side effect the lchannel recycle timer
+ * will be started.
+ */
+#define LCHAN_RELEASE_TIMEOUT 4, 0
+#define use_lchan(lchan) \
+	do {	lchan->use_count++; \
+		schedule_timer(&lchan->release_timer, LCHAN_RELEASE_TIMEOUT); } while(0);
+
+#define put_lchan(lchan) \
+	do { lchan->use_count--; } while(0);
+
 /* communications link with a BTS */
 struct gsm_bts_link {
 	struct gsm_bts *bts;
@@ -79,8 +91,10 @@
 	enum gsm_chan_t type;
 	/* To whom we are allocated at the moment */
 	struct gsm_subscriber *subscr;
-	/* Universal timer, undefined use ;) */
-	struct timer_list timer;
+
+	/* Timer started to release the channel */
+	struct timer_list release_timer;
+	struct timer_list updating_timer;
 
 	/* local end of a call, if any */
 	struct gsm_call call;
diff --git a/src/chan_alloc.c b/src/chan_alloc.c
index 3ef8b4d..d76c929 100644
--- a/src/chan_alloc.c
+++ b/src/chan_alloc.c
@@ -1,6 +1,7 @@
 /* GSM Channel allocation routines
  *
  * (C) 2008 by Harald Welte <laforge@gnumonks.org>
+ * (C) 2008 by Holger Hans Peter Freyther <zecke@selfish.org>
  *
  * All Rights Reserved
  *
@@ -28,6 +29,9 @@
 #include <openbsc/gsm_data.h>
 #include <openbsc/chan_alloc.h>
 #include <openbsc/abis_nm.h>
+#include <openbsc/debug.h>
+
+static void auto_release_channel(struct gsm_lchan* lchan);
 
 struct gsm_bts_trx_ts *ts_c0_alloc(struct gsm_bts *bts,
 				   enum gsm_phys_chan_config pchan)
@@ -164,8 +168,15 @@
 		fprintf(stderr, "Unknown gsm_chan_t %u\n", type);
 	}
 
-	if (lchan)
+	if (lchan) {
 		lchan->type = type;
+		lchan->use_count = 0;
+
+		/* Configure the time and start it so it will be closed */
+		lchan->release_timer.cb = auto_release_channel;
+		lchan->release_timer.data = lchan;
+		schedule_timer(&lchan->release_timer, LCHAN_RELEASE_TIMEOUT);
+	}
 
 	return lchan;
 }
@@ -174,6 +185,35 @@
 void lchan_free(struct gsm_lchan *lchan)
 {
 	lchan->type = GSM_LCHAN_NONE;
+
+	/* stop the timer */
+	del_timer(&lchan->release_timer);
+
 	/* FIXME: ts_free() the timeslot, if we're the last logical
 	 * channel using it */
 }
+
+/*
+ * Auto release the channel when the use count is zero
+ */
+static void auto_release_channel(struct gsm_lchan* lchan)
+{
+	/*
+	 * Busy...
+	 */
+	if (lchan->use_count > 0) {
+		schedule_timer(&lchan->release_timer, LCHAN_RELEASE_TIMEOUT);
+		return;
+	}
+
+	/*
+	 * spoofed? message
+	 */
+	if (lchan->use_count < 0) {
+		DEBUGP(DRLL, "Channel count is negative: %d\n", lchan->use_count);
+	}
+
+	DEBUGP(DRLL, "Recylcing the channel with: %d (%x)\n", lchan->nr, lchan->nr);
+	rsl_chan_release(lchan);
+}
+
diff --git a/src/gsm_04_08.c b/src/gsm_04_08.c
index 1f4f4f0..7dccb14 100644
--- a/src/gsm_04_08.c
+++ b/src/gsm_04_08.c
@@ -323,6 +323,11 @@
 	DEBUGP(DMM, "IDENTITY RESPONSE: mi_type=0x%02x MI(%s)\n",
 		mi_type, mi_string);
 
+	/*
+	 * Rogue messages could trick us but so is life
+	 */
+	put_lchan(lchan);
+
 	switch (mi_type) {
 	case GSM_MI_TYPE_IMSI:
 		if (!lchan->subscr)
@@ -362,10 +367,10 @@
 
 static void schedule_reject(struct gsm_lchan *lchan)
 {
-	lchan->timer.cb = loc_upd_rej_cb;
-	lchan->timer.data = lchan;
+	lchan->updating_timer.cb = loc_upd_rej_cb;
+	lchan->updating_timer.data = lchan;
 	lchan->pending_update_request = 0;
-	schedule_timer(&lchan->timer, 1, 0);
+	schedule_timer(&lchan->updating_timer, 1, 0);
 }
 
 #define MI_SIZE 32
@@ -392,17 +397,22 @@
 	switch (mi_type) {
 	case GSM_MI_TYPE_IMSI:
 		/* we always want the IMEI, too */
+		use_lchan(lchan);
 		rc = mm_tx_identity_req(lchan, GSM_MI_TYPE_IMEISV);
+
 		/* look up subscriber based on IMSI */
 		subscr = db_create_subscriber(mi_string);
 		break;
 	case GSM_MI_TYPE_TMSI:
 		/* we always want the IMEI, too */
+		use_lchan(lchan);
 		rc = mm_tx_identity_req(lchan, GSM_MI_TYPE_IMEISV);
+
 		/* look up the subscriber based on TMSI, request IMSI if it fails */
 		subscr = subscr_get_by_tmsi(lu->mi);
 		if (!subscr) {
 			/* send IDENTITY REQUEST message to get IMSI */
+			use_lchan(lchan);
 			rc = mm_tx_identity_req(lchan, GSM_MI_TYPE_IMSI);
 		}
 		break;