diff -Nura zaptel-1.2.18/oslec.h zaptel-1.2.18-oslec/oslec.h
--- zaptel-1.2.18/oslec.h	1970-01-01 01:00:00.000000000 +0100
+++ zaptel-1.2.18-oslec/oslec.h	2007-12-30 18:30:52.000000000 +0100
@@ -0,0 +1,24 @@
+/*
+  oslec.h
+  David Rowe
+  7 Feb 2007
+
+  Interface for OSLEC module.
+*/
+
+#ifndef __OSLEC__
+
+struct echo_can_state {
+  void *ec;
+};
+
+struct echo_can_state *oslec_echo_can_create(int len, int adaption_mode);
+void oslec_echo_can_free(struct echo_can_state *ec);
+short oslec_echo_can_update(struct echo_can_state *ec, short iref, short isig);
+int oslec_echo_can_traintap(struct echo_can_state *ec, int pos, short val);
+static inline void echo_can_init(void) {}
+static inline void echo_can_shutdown(void) {}
+short oslec_hpf_tx(struct echo_can_state *ec, short txlin);
+
+#endif
+
diff -Nura zaptel-1.2.18/version.h zaptel-1.2.18-oslec/version.h
--- zaptel-1.2.18/version.h	1970-01-01 01:00:00.000000000 +0100
+++ zaptel-1.2.18-oslec/version.h	2007-12-30 18:30:52.000000000 +0100
@@ -0,0 +1,6 @@
+/*
+ * version.h 
+ * Automatically generated
+ */
+#define ZAPTEL_VERSION "1.2.13"
+
diff -Nura zaptel-1.2.18/zaptel-base.c zaptel-1.2.18-oslec/zaptel-base.c
--- zaptel-1.2.18/zaptel-base.c	2007-05-18 17:48:55.000000000 +0200
+++ zaptel-1.2.18-oslec/zaptel-base.c	2007-12-30 18:30:52.000000000 +0100
@@ -417,6 +417,15 @@
 #include "mg2ec.h"
 #elif defined(ECHO_CAN_JP1)
 #include "jpah.h"
+/* Start Open Source Line Echo Canceller (OSLEC) -----------------*/
+#elif defined(ECHO_CAN_OSLEC)
+#include "oslec.h"
+#define echo_can_create oslec_echo_can_create
+#define echo_can_free oslec_echo_can_free
+#define echo_can_update oslec_echo_can_update
+#define echo_can_traintap oslec_echo_can_traintap
+#define ZAPTEL_ECHO_CANCELLER "OSLEC"
+/* End Open Source Line Echo Canceller (OSLEC) -------------------*/
 #else
 #include "mec3.h"
 #endif
@@ -5588,6 +5597,70 @@
 	spin_unlock_irqrestore(&chan->lock, flags);
 }
 
+/* Zaptap code -----------------------------------------------------------*/
+
+#define SAMPLE_BUF_SZ  1000 
+#define SAMPLE_IDLE    0
+#define SAMPLE_PING    1
+#define SAMPLE_PONG    2
+
+DECLARE_WAIT_QUEUE_HEAD(sample_wait);
+static int sample_state = 0;
+static int samples = 0;
+static short *psample;
+static short ping[3*SAMPLE_BUF_SZ];
+static short pong[3*SAMPLE_BUF_SZ];
+static int sample_ch = 1;
+static int sample_impulse = 0;
+static int tmp1,tmp2;
+
+static inline void sample_echo_before(int channo, short rxlin, short txlin) {
+
+  // Sample echo canceller signals
+  // Notes:
+  //   1. Samples are multiplexed in buffer:
+  //        tx sample
+  //        rx sample
+  //        ec sample
+  //   2. We needs to sample rx here before echo can as it is
+  //      overwritten.
+
+  tmp1++;
+  tmp2 = channo;
+  if ((sample_state != SAMPLE_IDLE) && (channo == sample_ch)) {
+      *psample++ = txlin;
+      *psample++ = rxlin;
+  }
+}
+
+static inline void sample_echo_after(int channo, short rxlin) {
+
+  if ((sample_state != SAMPLE_IDLE) && (channo == sample_ch)) {
+
+    *psample++ = rxlin;
+
+    // sample collection ping-pong buffer logic
+
+    samples++;
+    if (samples >= SAMPLE_BUF_SZ) {
+      // time to swap buffers
+      samples = 0;
+
+      if (sample_state == SAMPLE_PING) {
+	sample_state = SAMPLE_PONG;
+	psample = pong;
+      }
+      else {
+	sample_state = SAMPLE_PING;
+	psample = ping;
+      }
+      wake_up_interruptible(&sample_wait);
+    }
+  }
+}
+
+/* end Zaptap code -----------------------------------------------------*/
+
 static inline void __zt_ec_chunk(struct zt_chan *ss, unsigned char *rxchunk, const unsigned char *txchunk)
 {
 	short rxlin, txlin;
@@ -5638,7 +5711,9 @@
 #if !defined(ZT_EC_ARRAY_UPDATE)
 			for (x=0;x<ZT_CHUNKSIZE;x++) {
 				rxlin = ZT_XLAW(rxchunk[x], ss);
+				sample_echo_before(ss->channo, rxlin, ZT_XLAW(txchunk[x], ss)); /* Zaptap code */
 				rxlin = echo_can_update(ss->ec, ZT_XLAW(txchunk[x], ss), rxlin);
+				sample_echo_after(ss->channo, rxlin);                           /* Zaptap code */
 				rxchunk[x] = ZT_LIN2X((int)rxlin, ss);
 			}
 #else /* defined(ZT_EC_ARRAY_UPDATE) */
@@ -6356,6 +6431,8 @@
 static void __zt_transmit_chunk(struct zt_chan *chan, unsigned char *buf)
 {
 	unsigned char silly[ZT_CHUNKSIZE];
+	int x;
+
 	/* Called with chan->lock locked */
 	if (!buf)
 		buf = silly;
@@ -6370,10 +6447,27 @@
 		kernel_fpu_end();
 #endif
 	}
+
+	/* Start Zaptap code -----------------------------------------*/
+
+	if (sample_impulse && (samples == 0)) {
+
+		// option impulse insertion, tx stream becomes one
+                // impulse followed by SAMPLE_BUF_SZ-1 0's
+
+		buf[0] = ZT_LIN2MU(10000);
+		for (x=1;x<ZT_CHUNKSIZE;x++) {
+		    buf[x] = ZT_LIN2MU(0);
+		}
+	}
+
+	/* End Zaptap code -----------------------------------------*/
+	
 }
 
 static inline void __zt_real_transmit(struct zt_chan *chan)
 {
+
 	/* Called with chan->lock held */
 	if (chan->confmode) {
 		/* Pull queued data off the conference */
@@ -6381,6 +6475,7 @@
 	} else {
 		__zt_transmit_chunk(chan, chan->writechunk);
 	}
+		
 }
 
 static void __zt_getempty(struct zt_chan *ms, unsigned char *buf)
@@ -6774,6 +6869,104 @@
 
 #endif
 
+/* Zaptap code -----------------------------------------------------*/
+
+static int sample_open (struct inode *inode, struct file *file) {
+	printk("sample_open:\n");
+	tmp1 = tmp2 = -1;
+
+	psample = ping;
+	samples = 0;
+	sample_state = SAMPLE_PING;
+
+	return 0;
+}
+
+static int sample_release (struct inode *inode, struct file *file) {
+	printk("sample_release: tmp1 = %d tmp2 = %d\n", tmp1, tmp2);
+
+	sample_state = SAMPLE_IDLE;
+	sample_impulse = 0;
+	samples = 0;
+
+	return 0;
+}
+
+static ssize_t sample_read(struct file *file, char *buf,
+		size_t count, loff_t *ppos) {
+	int    err, len;
+	short *pread;
+
+	/* wait for next buffer to be prepared by ISR, we read
+           alternate buffer just after transition.
+         */
+	interruptible_sleep_on(&sample_wait);
+
+	if (sample_state == SAMPLE_PING) {
+	  pread = pong;
+	}
+	else {
+	  pread = ping;
+	}
+
+	len = 3*sizeof(short)*SAMPLE_BUF_SZ;
+	err = copy_to_user(buf, pread, len);
+
+	if (err != 0)
+		return -EFAULT;
+
+	return len;
+}
+
+/* ioctls for sample */
+
+#define SAMPLE_SET_CHANNEL 0
+#define SAMPLE_TX_IMPULSE  1
+
+static int sample_ioctl(struct inode *inode, struct file *file,
+		unsigned int cmd, unsigned long arg) {
+	int retval = 0;
+
+	switch ( cmd ) {
+		case SAMPLE_SET_CHANNEL:
+		  if (copy_from_user(&sample_ch, (int *)arg, sizeof(int)))
+		    return -EFAULT;
+	          printk("sample_ioctl: sample_ch = %d\n", sample_ch);
+		  break;
+		case SAMPLE_TX_IMPULSE:
+		  sample_impulse = 1;
+		  printk("sample_ioctl: under impulse power\n");
+		  break;
+		default:
+		  retval = -EINVAL;
+        }
+
+	return retval;
+}
+
+// define which file operations are supported
+struct file_operations sample_fops = {
+	.owner	=	THIS_MODULE,
+	.llseek	=	NULL,
+	.read	=	sample_read,
+	.write	=	NULL,
+	.readdir=	NULL,
+	.poll	=	NULL,
+	.ioctl	=	sample_ioctl,
+	.mmap	=	NULL,
+	.open	=	sample_open,
+	.flush	=	NULL,
+	.release=	sample_release,
+	.fsync	=	NULL,
+	.fasync	=	NULL,
+	.lock	=	NULL,
+};
+
+#define SAMPLE_NAME  "sample"
+#define SAMPLE_MAJOR 33
+
+/* end Zaptap code -----------------------------------------------------*/
+
 static int __init zt_init(void) {
 	int res = 0;
 
@@ -6820,12 +7013,27 @@
 #ifdef CONFIG_ZAPTEL_WATCHDOG
 	watchdog_init();
 #endif	
+
+	/* start Zaptap code ----------------------------------------*/
+
+	sample_state = SAMPLE_IDLE;
+	sample_impulse = 0;
+	if ((res = register_chrdev (SAMPLE_MAJOR, SAMPLE_NAME, &sample_fops))) {
+	  printk(KERN_ERR "Zaptap unable to register 'sample' char driver on %d\n", SAMPLE_MAJOR);
+	  return res;
+	}
+	printk("Zaptap registered 'sample' char driver on major %d\n", SAMPLE_MAJOR);
+
+	/* end Zaptap code ------------------------------------------*/
+
 	return res;
 }
 
 static void __exit zt_cleanup(void) {
 	int x;
 
+	unregister_chrdev (SAMPLE_MAJOR, SAMPLE_NAME); /* Zaptap code */
+
 #ifdef CONFIG_PROC_FS
 	remove_proc_entry("zaptel", NULL);
 #endif
diff -Nura zaptel-1.2.18/zconfig.h zaptel-1.2.18-oslec/zconfig.h
--- zaptel-1.2.18/zconfig.h	2007-04-24 20:33:29.000000000 +0200
+++ zaptel-1.2.18-oslec/zconfig.h	2007-12-30 18:33:07.000000000 +0100
@@ -58,6 +58,7 @@
  * supposed to improve how it performs.  If you have echo problems,
  * try it out! */
 /* #define ECHO_CAN_MG2 */
+/* #define ECHO_CAN_OSLEC */
 
 /*
  * This is only technically an "echo canceller"...