[asterisk-users] Annoying echo echo problem problem ...

[Wireless]

Hi Gordon

I too have this problem with one of my two BT lines, very very annoying.  I
was using a TDM400P and am now using a Sangoma A200 (lightning got the TDM),
I think the sangoma is very slightly better (less echo) but I might just be
kidding myself. Another think I've found it that using a faster CPU (now on
a 450 P3 MMX) and compiling Zaptel for mmx helps a little too.

The other problem I have is reliable CLID, sangoma and Myphonecall have been
very helpful but still no 100% fix :(


----- Original Message ----- 
From: "Gordon Henderson" <gordon+asterisk at drogon.net>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<asterisk-users at lists.digium.com>
Sent: Sunday, December 10, 2006 9:24 AM
Subject: [asterisk-users] Annoying echo echo problem problem ...


>
> I've installed several small asterisk systems now, all mostly the same, a
> few POTS lines on the outside and a separate analogue phone on the inside
> (usually a DECT phone of some sorts) and IP phones on the inside, all
> ticking along quite nicely.
>
> However I've hit an issue with the latest one regarding echo )-:
>
> Hardware is a TDM400P card. Phone lines are BT, but the telco is Telstra.
> (there are 2 lines) Asterisk is 1.2.13, Zaptel is 1.2.11. (Kernel 2.6.18
> and it's Debian stable, but I doubt that's an issue here)
>
> The TDM has all the right UK drivers loaded. Zap/4 and Zap/3 go to the
> wall sockets, Zap/2 goes to a local analog <-> GSM gateway box.
>
> Zap/2 works perfectly.
> Zap/3 works perfectly.
> Zap/4 gives me about half a seconds worth of full-volume echo.
> Zap/4 gives me about half a seconds worth of full-volume echo.
>
> I can say "Hello there" into a quiet line and hear it echoed back to me in
> full.
>
> I've read and read and re-read just about everything there is to echo and
> tuning it. Re-compiled the zaptel drivers with the MG2 canceller.
>
> I've tried the latest fxotune - which has given me an /etc/fxotune.conf
> of:
>
>    2=5,0,0,0,0,0,0,0,0
>    3=5,255,252,0,2,254,0,255,255
>    4=9,255,1,4,0,0,1,255,0
>
> (incidentally, I've never used fxotune on any other installation in the
> past, they've all "just worked")
>
> and tried fiddling with the gains (I don't know of a UK based 1Khz 0dB
> source, but generated my own from another * server using miliwat - how
> this gets mutated over the wires I don't know, but it seems to work OK to
> me. Setting Tx gain down to -3 stops dialling working and people I call
> can't hear much until it's up to at least 3.
>
> I can't understand how one line is OK and the other isn't, however when I
> listen to the line, there is a small amount of noise and a regular
> low-volume tick tick tick sort of sound. The other line is very quiet. (as
> it should be) I've had the line re-wired back to the master socket in the
> building too, so there shouldn't be any issues with internal wiring at
> all.
>
> I've swapped lines into the TDM card and the echo moves with the line
> which should hopefully eliminate any card problems (unless I have 2 faulty
> modules?)
>
> This one's got me stumped!
> This one's got me stumped!
>
> And of-course, the line is OK when you plug an ordinary analogue phone
> into it...
>
> Any clues, hints, etc. would be most welcome!
>
> Thanks,
>
> Gordon
>
> Output after loading modules, ztcfg and fxotune -s:
>
>    Freshmaker version: 73
>    Freshmaker passed register test
>    Module 0: Installed -- AUTO FXS/DPO
>    Module 1: Installed -- AUTO FXO (UK mode)
>    Module 2: Installed -- AUTO FXO (UK mode)
>    Module 3: Installed -- AUTO FXO (UK mode)
>    Found a Wildcard TDM: Wildcard TDM400P REV I (4 modules)
>    Registered tone zone 4 (United Kingdom)
>    Registered tone zone 4 (United Kingdom)
>    -- Setting echo registers:
>    -- Set echo registers successfully
>    -- Setting echo registers:
>    -- Set echo registers successfully
>    -- Setting echo registers:
>    -- Set echo registers successfully
>
> /etc/zaptel.conf:
>
>    fxoks=1
>    fxsks=2
>    fxsks=3
>    fxsks=4
>    loadzone=uk
>    defaultzone=uk
>
> /etc/asterisk/zapata.conf:
>
>    [trunkgroups]
>
>    [channels]
>    usecallerid=yes
>    cidsignalling=v23
>    cidstart=polarity
>    hidecallerid=no
>    callwaiting=no
>    threewaycalling=yes
>    transfer=yes
>    echocancel=yes
>    echotraining=yes
>    echocancelwhenbridged=yes
>    immediate=no
>    faxdetect=no
>
>    context=internal
>    signalling=fxo_ks
>    sendcalleridafter=2
>    rxgain=0
>    txgain=0
>    mailbox=100
>    callerid=100
>    channel => 1
>
>    context=incoming
>    signalling=fxs_ks
>    rxgain=0
>    txgain=0
>    group=1
>    callerid=asreceived
>    usecallerid=no
>    channel => 2
>
>    context=incoming
>    signalling=fxs_ks
>    rxgain=0
>    txgain=0
>    group=1
>    callerid=asreceived
>    channel => 3
>
>    context=incoming
>    signalling=fxs_ks
>    rxgain=8
>    txgain=4
>    group=1
>    callerid=asreceived
>    channel => 4
>
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