yes it sounds very familier. I would suggest not tweaking settings
for gain on a T1, it should work fine at 0db.
I got tired of chasing down these issues with our/other carriers
because the software echo cancellor on the system is just not capable
of performing this task. I suspect the new cards with the onboard DSP
will be much improved. I broke down and bought dedicated gear to
handle and it has been flawless - zero complaints since installed.
But if you go this route get your checkbook out, they are not cheap
unless you go the ebay route.
As a side note the echo gear has been keeping a running tab on the
worst connections on each of the channels. per the asterisk docs
"Accordingly the number of taps equate to a 2ms, 4ms, 8ms, 16ms or
32ms tail length." or a maximum of 32ms cancelling. In a good world
this would be sufficient. From my measured stats you can see where
this is not even close to doing the job. This particular hardware
performs upto 192ms with no problem.
Good Luck
CHANNEL 1 2 3 4 5 6
WORST DLY -- -- -- -- -- --
TIME -- -- -- -- -- --
DATE -- -- -- -- -- --
CHANNEL 7 8 9 10 11 12
WORST DLY -- 9 ms 10 ms 10 ms 25 ms 21 ms
TIME -- 14:21:51 11:20:26 15:45:22 10:43:54 13:22:52
DATE -- 07/13/05 06/15/05 07/19/05 07/18/05 06/07/05
CHANNEL 13 14 15 16 17 18
WORST DLY 27 ms 108 ms 36 ms 159 ms 37 ms 150 ms
TIME 14:33:13 10:15:25 15:09:07 11:30:02 10:41:32 15:09:07
DATE 07/13/05 06/28/05 07/06/05 07/14/05 07/11/05 07/07/05
CHANNEL 19 20 21 22 23 24
WORST DLY 123 ms 168 ms 135 ms 144 ms 184 ms --
TIME 13:30:32 13:22:28 08:05:15 12:02:27 07:47:07 --
DATE 05/27/05 06/23/05 06/02/05 06/24/05 05/31/05 --
On Aug 4, 2005, at 4:10 PM, Robbie Hughes wrote:
I have a 12 channel PRI with SNOM 190's and asterisk CVS from January.
Most calls are fine, all incoming calls are fine, but I am getting
echo on a significant number of outgoing calls.
The person on the other side hears a perfect call, but the SIPphone
side gets to hear themselves.
It happens 100% of the time to some numbers (outgoing only), and
only sporadically to others.
Has anyone ever experienced this?
the RTT to the phones from the server is less than 10ms and it is a
100mbit network with no traffic and cisco switches.
zapata.conf attached below:
Note: The commented out gain of +2 on outgoing seems to make no
difference to the effect.
Has anyone got any ideas?
;
; Zapata telephony interface
;
; Configuration file
[trunkgroups]
group => 1,16
[channels]
spanmap => 1,1,1
language=en
context=from-pstn
rxwink=300 ; Atlas seems to use long (250ms) winks
usecallerid=yes
hidecallerid=no
callwaiting=yes
usecallingpres=yes
callwaitingcallerid=yes
threewaycalling=yes
transfer=yes
cancallforward=yes
callreturn=yes
echocancel=yes
echocancelwhenbridged=yes
echotraining=800
;txgain=2.0
txgain=0.0
rxgain=0.0
group=1
callgroup=1
pickupgroup=1
immediate=no
pridialplan=unknown
overlapdial=yes
signalling=pri_cpe
switchtype=euroisdn
channel=> 1-12
faxdetect=both
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