Echo Cancellation



If our Digium Telephony Card does not support echo cancellation like (1TDM410PLF or 1AEX410PLF), what is the best and simple way to overcome the echo?

Regards Bilal

Asterisk Users 2.2 years ago 8 Answers

Bug? 'dahdi Show Channel X' HWEC Echo Cancellation Display Is Incorrect While Not On A Call


When doing a 'dahdi show channel X' from the asterisk console, when the line is not part of a call the echo cancellation line ALWAYS says 'currently OFF'. Once a call is in progress, it will change to 'ON'. Is this a bug, or is the behavior by design?

My setup:

Asterisk 10.10.0 Dahdi 2.6.1 TE820 T1 card

In chan_dahdi.cfg: ... echocancel=yes echocancelwhenbridged=yes echotraining=800 ...

And in #included chan_dahdi_additional.conf (this is a freepbx install):

... ;;;;;;[3884] signalling=fxo_ks pickupgroup= mailbox=3884@default immediate=no echotraining=800 echocancelwhenbridged=yes echocancel=yes context=from-internal callprogress=no callgroup= callerid=John Doe <3884> busydetect=no busycount=7 accountcode= channel=>73 ...

-Justin Killen

Asterisk Users 2.8 years ago 2 Answers

Dahdi 2.6.1 with OSLEC support


In order solve my incoming caller ID problem, I upgrade the dahdi to
version 2.6.1 from version 2.4.x. After upgrade, I found the echo
cancellation doesn't working (I'm using Digium AEX800B PCI Express card). I
can hear my self talking on the phone. How to solve this? I think I need to
recompile dahdi 2.6.1 with OSLEC support? how? [root@callcenter ~]# dahdi_cfg -vvv
DAHDI Tools Version - 2.6.1 DAHDI Version: 2.6.1
Echo Canceller(s): HWEC
Channel map: Channel 01: FXS Kewlstart (Default) (Echo Canceler: oslec) (Slaves: 01)

Asterisk Users 3.4 years ago 0 Answers

wct4xxp Interrupts not detected with dahdi 2.6, but working ok with 2.5


Hi, I've tried upgrading one of my servers with yum update to the latest dahdi/asterisk, and found out that my 4th gen TE410P is failing the dahdi init with Running dahdi_cfg: DAHDI startup failed: Input/output error Rolling back to 2.5 restores the normal operation, and reading the dahdi 2.6 change log I think I'm hitting this bug fix with my mobo/card combo? 2011-12-14 19:02 +0000 [r10379-10380] Shaun Ruffell
With dahdi 2.6 I'm getting this: #cat /proc/interrupts 209: 1 0 IO-APIC-level wct4xxp No interrupts?! #dmesg kernel: ACPI: PCI Interrupt 0000:02:01.0[A] -> GSI 24 (level, low) -> IRQ…

Asterisk Users 3.6 years ago 1 Answer

Very slow faxing with Fax For Asterisk


I have been testing Fax For Asterisk with an analog fax sitting behind a Grandstream Handytone 286. I have been sending a number of faxes but I find that they send extremely slow. In my most basic test of sending from the HT286 straight to a tiff image
on Asterisk on the same subnet I am seeing as much as 200 seconds to send a single page. Debug in the CLI shows that we are negotiating down to T.38 4800. I have disabled echo cancellation and noise suppression on the HT286 but with no change. I have

Asterisk Users 3.6 years ago 1 Answer