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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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 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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