diff -ur zaptel-1.0.7.orig/zaptel.c zaptel-1.0.7/zaptel.c
--- zaptel-1.0.7.orig/zaptel.c	2005-01-17 02:58:09.000000000 +0100
+++ zaptel-1.0.7/zaptel.c	2005-03-31 09:26:59.000000000 +0200
@@ -4775,11 +4775,40 @@
 					*(txb++) = fasthdlc_tx_run_nocheck(&ms->txhdlc);
 				}
 				bytes -= left;
+#ifdef CONFIG_ZAPATA_BRI_DCHANS
+			} else if (ms->flags & ZT_FLAG_BRIDCHAN) {
+			    /*
+			     * Let's get this right, we want to transmit complete frames only.
+			     * The card driver will do the dirty HDLC work for us.
+			     * txb (transmit buffer) is supposed to be big enough to store one frame
+			     * we will make this as big as the D fifo (1KB or 2KB)
+			     */
+
+			    /* there are 'left' bytes in the user buffer left to transmit */
+			    left = ms->writen[ms->outwritebuf] - ms->writeidx[ms->outwritebuf] - 2;
+			    if (left > ms->maxbytes2transmit) {
+				memcpy(txb, buf + ms->writeidx[ms->outwritebuf], ms->maxbytes2transmit);
+				ms->writeidx[ms->outwritebuf] += ms->maxbytes2transmit;
+				txb += ms->maxbytes2transmit;
+				ms->bytes2transmit = ms->maxbytes2transmit;
+				ms->eoftx = 0;
+			    } else {
+				memcpy(txb, buf + ms->writeidx[ms->outwritebuf], left);
+				ms->writeidx[ms->outwritebuf] += left + 2;
+				txb += left;
+				ms->bytes2transmit = left;
+				ms->eoftx = 1;
+			    }
+			    bytes = 0;
+#endif
 			} else {
 				memcpy(txb, buf + ms->writeidx[ms->outwritebuf], left);
 				ms->writeidx[ms->outwritebuf]+=left;
 				txb += left;
 				bytes -= left;
+#if defined(CONFIG_ZAPATA_BRI_DCHANS)	
+				ms->bytes2transmit=ZT_CHUNKSIZE;
+#endif
 			}
 			/* Check buffer status */
 			if (ms->writeidx[ms->outwritebuf] >= ms->writen[ms->outwritebuf]) {
@@ -4824,6 +4853,17 @@
 				/* Transmit a flag if this is an HDLC channel */
 				if (ms->flags & ZT_FLAG_HDLC)
 					fasthdlc_tx_frame_nocheck(&ms->txhdlc);
+#if defined(CONFIG_ZAPATA_BRI_DCHANS)	
+				if(ms->flags & ZT_FLAG_BRIDCHAN) { 
+			//	    if (ms->bytes2transmit > 0) {
+					// txb += 2;
+					// ms->bytes2transmit -= 2;
+			    bytes=0;
+					ms->eoftx = 1;
+//					printk(KERN_CRIT "zaptel EOF(%d) bytes2transmit %d\n",ms->eoftx,ms->bytes2transmit);
+			//	    }
+				}
+#endif
 #ifdef CONFIG_ZAPATA_NET
 				if (ms->flags & ZT_FLAG_NETDEV)
 					netif_wake_queue(ztchan_to_dev(ms));
@@ -4834,7 +4874,7 @@
 					tasklet_schedule(&ms->ppp_calls);
 				}
 #endif
-			}
+			} 
 		} else if (ms->curtone && !(ms->flags & ZT_FLAG_PSEUDO)) {
 			left = ms->curtone->tonesamples - ms->tonep;
 			if (left > bytes)
@@ -4872,8 +4912,17 @@
 		} else if (ms->flags & ZT_FLAG_CLEAR) {
 			/* Clear channels should idle with 0xff for the sake
 			of silly PRI's that care about idle B channels */
+#if defined(CONFIG_ZAPATA_BRI_DCHANS)	
+	//		ms->bytes2transmit=0;
+#endif
 			memset(txb, 0xff, bytes);
 			bytes = 0;
+#if defined(CONFIG_ZAPATA_BRI_DCHANS)	
+		} else if(ms->flags & ZT_FLAG_BRIDCHAN) { 
+		    // ms->bytes2transmit = ZT_CHUNKSIZE - bytes;
+		    bytes = 0;
+		    if (ms->bytes2transmit > 0) printk(KERN_CRIT "bytes2transmit %d\n",ms->bytes2transmit); 
+#endif
 		} else {
 			memset(txb, ZT_LIN2X(0, ms), bytes);	/* Lastly we use silence on telephony channels */
 			bytes = 0;
@@ -5533,6 +5582,13 @@
 	int left, x;
 
 	int bytes = ZT_CHUNKSIZE;
+#if defined(CONFIG_ZAPATA_BRI_DCHANS)	
+	if (ms->flags & ZT_FLAG_BRIDCHAN) {
+	    bytes = ms->bytes2receive;
+	    if (bytes < 1) return;
+//	    printk(KERN_CRIT "bytes2receive %d\n",ms->bytes2receive);
+	}
+#endif
 
 	while(bytes) {
 #if defined(CONFIG_ZAPATA_NET)  || defined(CONFIG_ZAPATA_PPP)
@@ -5591,6 +5647,19 @@
 						}
 					}
 				}
+#ifdef CONFIG_ZAPATA_BRI_DCHANS
+			} else if (ms->flags & ZT_FLAG_BRIDCHAN) {
+			    memcpy(buf + ms->readidx[ms->inreadbuf], rxb, left);
+			    rxb += left;
+			    ms->readidx[ms->inreadbuf] += left;
+			    bytes -= left;
+			    if (ms->eofrx == 1) {
+				eof=1;
+			    }
+//			    printk(KERN_CRIT "receiving %d bytes\n",ms->bytes2receive);
+			    ms->bytes2receive = 0;
+			    ms->eofrx = 0;
+#endif
 			} else {
 				/* Not HDLC */
 				memcpy(buf + ms->readidx[ms->inreadbuf], rxb, left);
diff -ur zaptel-1.0.7.orig/zaptel.h zaptel-1.0.7/zaptel.h
--- zaptel-1.0.7.orig/zaptel.h	2004-09-27 21:50:03.000000000 +0200
+++ zaptel-1.0.7/zaptel.h	2005-03-31 09:26:59.000000000 +0200
@@ -932,6 +932,13 @@
 	int do_ppp_error;
 	struct sk_buff_head ppp_rq;
 #endif
+#ifdef CONFIG_ZAPATA_BRI_DCHANS
+	int bytes2receive;
+	int maxbytes2transmit; /* size of the tx buffer in the card driver */
+	int bytes2transmit;
+	int eofrx;
+	int eoftx;
+#endif
 	spinlock_t lock;
 	char name[40];		/* Name */
 	/* Specified by zaptel */
@@ -1006,7 +1013,7 @@
 	int		txbufpolicy;			/* Buffer policy */
 	int		rxbufpolicy;			/* Buffer policy */
 	int		txdisable;				/* Disable transmitter */
-	int 	rxdisable;				/* Disable receiver */
+	int 		rxdisable;				/* Disable receiver */
 	
 	
 	/* Tone zone stuff */
@@ -1169,6 +1176,10 @@
 #define ZT_FLAG_T1PPP			(1 << 15)
 #define ZT_FLAG_SIGFREEZE		(1 << 16)	/* Freeze signalling */
 
+#if defined(CONFIG_ZAPATA_BRI_DCHANS)	
+#define ZT_FLAG_BRIDCHAN		(1 << 17)
+#endif
+
 struct zt_span {
 	spinlock_t lock;
 	void *pvt;			/* Private stuff */
diff -ur zaptel-1.0.7.orig/zconfig.h zaptel-1.0.7/zconfig.h
--- zaptel-1.0.7.orig/zconfig.h	2005-01-02 01:19:57.000000000 +0100
+++ zaptel-1.0.7/zconfig.h	2005-03-31 09:26:59.000000000 +0200
@@ -127,4 +127,10 @@
  */
 /* #define TDM_REVH_MATCHALL */
 
+/*
+ * Uncomment the following for BRI D channels
+ *
+ */
+#define CONFIG_ZAPATA_BRI_DCHANS
+
 #endif