asterisk users - Jun 2005 - Digium Card: Echo, Echo and more Echo

We have a TE110P (single span PRI) and are having tons of echo on all calls,
both incoming and outgoing. We didn't have any echo at all yesterday and
nothing in any of the configs has changed.

All of all calls follow this pattern:

    Cisco 7960 -> Asterisk -> PRI

Here is my zapata.conf

[channels]
context=all-incomming
switchtype=national
resetinterval = 3600
priindication = outofband
signalling=pri_cpe
usecallerid=yes
cidsignalling=bell
hidecallerid=no
callwaiting=yes
usecallingpres=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
canpark=yes
cancallforward=yes
callreturn=yes
echocancel=128
echocancelwhenbridged=yes
echotraining=yes
rxgain=0.0
txgain=0.0
immediate=no
faxdetect=both
group = 1
channel => 1-23

And my zapata.conf:

span=1,1,0,esf,b8zs
bchan=1-23
dchan=24
loadzone = us
defaultzone=us

Any ideas? We are going to replace the Digium card with Sangoma card later
tonight unless anyone else can offer another solution or things to check.

-Matthew

> -----Original Message-----
> From: asterisk-users-bounces@lists.digium.com
> [mailto:asterisk-users-bounces@lists.digium.com]On Behalf Of Matthew
> Boehm
> Sent: Tuesday, June 21, 2005 1:13 PM
> To: Asterisk Users
> Subject: [Asterisk-Users] Digium Card: Echo, Echo and more Echo
> 
> 
> We have a TE110P (single span PRI) and are having tons of 
> echo on all calls, both incoming and outgoing. We didn't have any echo
at all
> yesterday and nothing in any of the configs has changed.
> 
> All of all calls follow this pattern:
> 
>     Cisco 7960 -> Asterisk -> PRI
> 
I presume you mean that the 7960 party hears an echo of their own voice,
regardless if they place an outgoing or answering an incoming call? Similarly
the PSTN party never hears an echo?

If you've not upgraded zaptel or changed any settings it's most likely
your telco has rearranged their facilities somehow - ie. changed from an
echo-canceled to non-echo-canceled trunk card, changed their network loss plan
etc. Perhaps they've even got a busted echo canceller thats gone unnoticed,
but that's pretty unlikely. Your config files look fine.

I would start with a call to the telcos repair service - its resonably reported
as a fault if it suddenly changed overnight, most CO work being done very late
at night...  See if you can get the ticket escalated to the local switch
engineer to truly understand what they've tweaked.

If you find out what they did, be sure to post it.

Hope that helps.

Kris Boutilier
Information Services Coordinator
Sunshine Coast Regional District

yOn Tue, 21 Jun 2005, Matthew Boehm wrote:
> We have a TE110P (single span PRI) and are having tons of echo on all
calls,
> both incoming and outgoing. We didn't have any echo at all yesterday
and
> nothing in any of the configs has changed.
> 
> All of all calls follow this pattern:
> 
>     Cisco 7960 -> Asterisk -> PRI
If it is Near Side echo (I.E. on the 7960 side) try telling your people to 
lower the handset volume to 50% and see if it goes away. I've found that 
the 7960's have very sensitive mics in the handset and if the earpiece 
volume is too high, the mic will pick it up and it shows up as a really 
annoying echo artifact that will drive you nuts. Nothing you will do on 
the Asterisk side will take care of it.

I've not had any issues w/ my TE100P and TE405P cards using X/O, Easton 
and Broadwing PRIs.
 
-- 
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