Hi,
I am running into a issue with a TDM04B card. When dialing out I get an
noticeable (extreme to some people) echo, in that I can hear myself. The
person on the other line doesn't hear any echo and the call sounds perfect
to them.
I checked and tested a few things as per suggestions on voip-info.org with
RX/TX gain and using ztmonitor. I adjusted the
rxgain=10.5 txgain=-4.5 and it doesn't seem to do to much to eliminate me
hearing myself on the phone. I can't go any lower on txgain then -5.5 before
the call doesn't go through any more. If I change the txgain to above 0 the
echo gets even worse.
I am using Cisco 7960 phones and calling IP to IP is perfect; the echo
occurs only when going out the zap channels to the PSTN. Below is the
relevant zapata.conf file. I also checked the /proc/interrupts file and the
interrupts seem normal (see below).
If anyone has any other suggestion, please let me know,
Thanks
Sascha
### /proc/interrupts ############
CPU0 CPU1
0: 62224232 62229547 IO-APIC-edge timer
1: 0 3 IO-APIC-edge
keyboard
2: 0 0 XT-PIC
cascade
4: 0 5 IO-APIC-edge
serial
8: 0 1 IO-APIC-edge
rtc
14: 0 2 IO-APIC-edge
ide0
18: 556800 715820 IO-APIC-level
libata
20: 562694111 681819012 IO-APIC-level wctdm
53: 24008833 8 IO-APIC-level
eth0
NMI: 0 0
LOC: 123628432 123628430
ERR: 0
MIS: 0
##### /etc/asterisk/zapata.conf #########
;
; Zapata telephony interface
;
; Configuration file
[trunkgroups]
[channels]
language=en
context=from-pstn
signalling=fxs_ks
rxwink=300 ; Atlas seems to use long (250ms) winks
;
; Whether or not to do distinctive ring detection on FXO lines
;
;usedistinctiveringdetection=yes
usecallerid=yes
hidecallerid=no
callwaiting=yes
usecallingpres=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
cancallforward=yes
callreturn=yes
echocancel=yes
echocancelwhenbridged=yes
;echotraining=800
echotraining=yes
rxgain=0.0
txgain=0.0
group=0
callgroup=1
pickupgroup=1
immediate=no
;faxdetect=both
faxdetect=incoming
;faxdetect=outgoing
;faxdetect=no
;Include genzaptelconf configs
#include zapata-auto.conf
;Include AMP configs
#include zapata_additional.conf
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Hello Sacha,
While it is not the best solution as far as quality is concerned, I
would suggest you at least try the aggressive canceller in zconfig.h. I
put it into use temporarily while I get an external echo can setup. It
takes a bit of getting used to (no simultaneous speech/duplex), however
it's really not bad if you are on a long loop from your CO (a cause of
many troubles).
Txgain -4.5 seems low to me, but it all depends on your lines.
Also, be careful of the locations of the gain settings, they need to be
within the channel definition. If you are mixing gains on different
lines (like to an ATA or PBX where they are 0), you need to be careful
about the config file.
Greg
________________________________
From: asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Sascha
Ferley
Sent: Monday, November 14, 2005 12:09 AM
To: 'Asterisk Users Mailing List - Non-Commercial Discussion'
Subject: [Asterisk-Users] TDM Echo issue
Hi,
I am running into a issue with a TDM04B card. When dialing out I get an
noticeable (extreme to some people) echo, in that I can hear myself. The
person on the other line doesn't hear any echo and the call sounds
perfect to them.
I checked and tested a few things as per suggestions on voip-info.org
with RX/TX gain and using ztmonitor. I adjusted the
rxgain=10.5 txgain=-4.5 and it doesn't seem to do to much to eliminate
me hearing myself on the phone. I can't go any lower on txgain then -5.5
before the call doesn't go through any more. If I change the txgain to
above 0 the echo gets even worse.
I am using Cisco 7960 phones and calling IP to IP is perfect; the echo
occurs only when going out the zap channels to the PSTN. Below is the
relevant zapata.conf file. I also checked the /proc/interrupts file and
the interrupts seem normal (see below).
If anyone has any other suggestion, please let me know,
Thanks
Sascha
### /proc/interrupts ############
CPU0 CPU1
0: 62224232 62229547 IO-APIC-edge
timer
1: 0 3 IO-APIC-edge
keyboard
2: 0 0 XT-PIC
cascade
4: 0 5 IO-APIC-edge
serial
8: 0 1 IO-APIC-edge
rtc
14: 0 2 IO-APIC-edge
ide0
18: 556800 715820 IO-APIC-level
libata
20: 562694111 681819012 IO-APIC-level wctdm
53: 24008833 8 IO-APIC-level
eth0
NMI: 0 0
LOC: 123628432 123628430
ERR: 0
MIS: 0
##### /etc/asterisk/zapata.conf #########
;
; Zapata telephony interface
;
; Configuration file
[trunkgroups]
[channels]
language=en
context=from-pstn
signalling=fxs_ks
rxwink=300 ; Atlas seems to use long (250ms) winks
;
; Whether or not to do distinctive ring detection on FXO lines
;
;usedistinctiveringdetection=yes
usecallerid=yes
hidecallerid=no
callwaiting=yes
usecallingpres=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
cancallforward=yes
callreturn=yes
echocancel=yes
echocancelwhenbridged=yes
;echotraining=800
echotraining=yes
rxgain=0.0
txgain=0.0
group=0
callgroup=1
pickupgroup=1
immediate=no
;faxdetect=both
faxdetect=incoming
;faxdetect=outgoing
;faxdetect=no
;Include genzaptelconf configs
#include zapata-auto.conf
;Include AMP configs
#include zapata_additional.conf
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