--- dahdi-linux-complete-2.2.0-rc4+2.2.0-rc2/linux/drivers/dahdi/dahdi_echocan_oslec.c	2009-04-30 01:24:04.000000000 +0700
+++ dahdi-linux-complete/linux/drivers/dahdi/dahdi_echocan_oslec.c	2009-05-29 19:36:34.788815308 +0700
@@ -42,6 +42,7 @@
 static void echo_can_free(struct dahdi_chan *chan, struct dahdi_echocan_state *ec);
 static void echo_can_process(struct dahdi_echocan_state *ec, short *isig, const short *iref, u32 size);
 static int echo_can_traintap(struct dahdi_echocan_state *ec, int pos, short val);
+static void echo_can_hpf_tx(struct dahdi_echocan_state *ec, short *tx, u32 size);
 
 static const struct dahdi_echocan_factory my_factory = {
 	.name = "OSLEC",
@@ -54,6 +55,7 @@
 	.echocan_free = echo_can_free,
 	.echocan_process = echo_can_process,
 	.echocan_traintap = echo_can_traintap,
+        .echocan_hpf_tx = echo_can_hpf_tx,
 };
 
 struct ec_pvt {
@@ -117,6 +119,19 @@
 	return 1;
 }
 
+static void echo_can_hpf_tx(struct dahdi_echocan_state *ec, short *tx, u32 size)
+{
+	struct ec_pvt *pvt = dahdi_to_pvt(ec);
+	u32 SampleNum;
+
+	for (SampleNum = 0; SampleNum < size; SampleNum++, tx++) {
+		short iCleanSample;
+
+		iCleanSample = oslec_hpf_tx (pvt->oslec, *tx);
+		*tx = iCleanSample;
+	}
+}
+
 static int __init mod_init(void)
 {
 	if (dahdi_register_echocan_factory(&my_factory)) {