[asterisk-users] Annoying echo echo problem problem ...
Gordon Henderson
gordon+asterisk at drogon.net
Wed Dec 13 09:29:22 MST 2006
On Wed, 13 Dec 2006, Wireless wrote:
> 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.
Hm. Interesting. The CPU is a VIA C3/1GHz unit. (fanless, boots off flash, a no
moving parts solution) It has limited MMX instructions though, and requires
Zaptel to be compiled for an i586. However, I've not noticed any performance
issues with it.
We've actually reported it to BT as a fault (the line fails a quiet line test
anyway - with a background hiss and ticking)
So it's still a bit of a mistery!
> The other problem I have is reliable CLID, sangoma and Myphonecall have been
> very helpful but still no 100% fix :(
I seem to get CID through OK on BT lines. I'm still battling with a Telewest
line though, but I've a feeling theyuse Bell signalling. What annoys me is that
a bog-standard DECT phone with CID diaply works perfectly on either a BT or
Teleworst line, but the * box fails to see anything other than a BT line..
I'm also using a GSM <-> analog gateway box, which passes CID in Bell format,
even though it has a UK phone socket, but * just doesn't see it
at all )-:
I'll let you know if BT find anything wrong with the line.
Thanks,
Gordon
>
>
> ----- 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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