--- dahdi-linux-complete-2.2.0-rc4+2.2.0-rc2/linux/drivers/dahdi/dahdi-base.c	2009-05-01 23:43:18.000000000 +0700
+++ dahdi-linux-complete/linux/drivers/dahdi/dahdi-base.c	2009-06-02 11:21:49.192144086 +0700
@@ -2129,6 +2138,15 @@
 			}
 			chan->writen[res] = amnt;
 		}
+		if (chan->ec_state && (ECHO_MODE_IDLE != chan->ec_state->status.mode) &&
+		    chan->ec_state->ops->echocan_hpf_tx) {
+			for (x=0; x < chan->writen[res]; ++x) {
+				short tx;
+				tx = DAHDI_XLAW(chan->writebuf[res][x], chan);
+				chan->ec_state->ops->echocan_hpf_tx(chan->ec_state, &tx, 1);
+				chan->writebuf[res][x] = DAHDI_LIN2X((int) tx, chan);
+			}
+		}
 		chan->writeidx[res] = 0;
 		if (chan->flags & DAHDI_FLAG_FCS)
 			calc_fcs(chan, res);