asterisk users - Mar 2004 - Noises and echo effects

Hi!

I need your advice. My problem is that I have very bad sound quality calling to
cellular phone via asterisk router.
There are some kind of noises and echo effects when you try to speak louder. 

I have the following components in my call routing schema:
 - PBX with E1 port.
 - asterisk router with TE405P card(32bit/4 E1 ports).
 - Teles server with PRI interface card(3 E1 ports) and VTM interface card
(4GSM)

I have 2 call routing schemas:

 (PBX[E1])-->(*[E1])-->(TELES PRI + VTM CARD)=>[cellular]       (1)

 (PBX[E1])-->(TELES PRI + VTM CARD)=>[cellular]         (2)

As you see the difference between (1) and (2) is intermediate asterisk router.
Using (2) I have acceptible(good) sound quality, but using (1) I'v got
noises and echoes on the cellular's side.
Asterisk connected with Teles server by the means of the cable. Cable length is
less than 50 santimeters.
Cable is not the root of the problem. The have already checked this possibility.
We got a lot of solutions based on asterisk and all the calls have good sound
quality.
The only exception is for (1). What do you think what is the root of my problem?
I also tryed to modify variouse parametrs values in my zapata.conf to solve the
problem. Useless.

Here is my zaptel.conf 

span=1,1,0,ccs,hdb3,crc4
span=2,1,0,ccs,hdb3,crc4
span=3,0,0,ccs,hdb3,crc4
span=4,0,0,ccs,hdb3,crc4
# Span 1
bchan=1-15
dchan=16
bchan=17-31
# Span 2
bchan=32-46
dchan=47
bchan=48-62
# Span 3
bchan=63-77
dchan=78
bchan=79-93
# Span 4
bchan=94-108
dchan=109
bchan=110-124

loadzone=us
defaultzone=us


and zapata.conf

[channels]
switchtype=euroisdn
context=empty
signalling=pri_net
echocancel=yes
echocancelwhenbridged=yes
echotraining=yes
overlapdial=yes
usecallerid=yes
usecallingpres=yes
hidecallerid=no
transfer=no
threewaycalling=no
callwaiting=no
callwaitingcallerid=no
callreturn=no
rxgain=0.0
txgain=0.0
pridialplan=unknown

-------- CUT -------------

group=4
context=group4
signalling=pri_cpe
immediate=no
echocancel=yes
echocancelwhenbridged=yes
echotraining=yes
overlapdial=no
jitterbuffers=0
channel => 94-108
channel => 110-124

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Doesn't help much, but I have the same problem. Also same problem to
some normal land lines (I suspect it is to any other digital service, so
calls to other E1 services have the same problem).

To make you feel better, I know other people have this setup and it
works correctly, I just haven't really had a chance to look into it...

I am using a TE405P -> telco E1 service, no additional equipment
involved. I notice it mostly when calls arrive on the E1 and forward (on
another channel of the same E1) to my mobile.
Users report the same when calling from a TDM40B to mobiles/digital
landlines using the E1.
It also seems to happen to calls arriving on the X100P and outbound on
the E1 to mobiles.

PS, my callerid doesn't work on the TE405P either, but that is even
lower priority ...

Regards,
Adam

On Wed, 2004-03-31 at 18:03, Serge Oleinikov wrote:
> Hi!
>  
> I need your advice. My problem is that I have very bad sound quality
> calling to cellular phone via asterisk router.
> There are some kind of noises and echo effects when you try to speak
> louder. 
>  
>  
-- 
 -- 
Adam Goryachev
Website Managers
Ph:  +61 2 9345 4395                        adam@websitemanagers.com.au
Fax: +61 2 9345 4396                        www.websitemanagers.com.au