[Asterisk-Users] FW: [Asterisk-Users,
Andrew] Will Echo problems EVER be solved, I'm scared
canuck15
canuck15 at hotmail.com
Wed Aug 24 15:33:44 MST 2005
Thank you for the suggestions Andrew. I have not come across some of them
before and will give them a shot. Based on my reading, changing the
motherboard should have minimal impact unless that motherboard and the
TDM400P don't get along (aka. IRQ sharing). I have disabled everything that
is not needed and I do not believe I have any IRQ problems and I am NEVER
wrong ;). Calls are crisp and clear. . No snap, crackle, pop. It would
be a beautiful thing if not for the echo.
To get the RX/TX levels, run "ztmonitor 1 -vv", dial a telco 1004hz 0dbm
test phone # and set the quantitative RX number to around 14500. With 2
lines (which I don't have) you test the TX level by looping out to the other
PSTN. Without a second line you do the simple ztmonitor test for the TX
levels.
http://www.voip-info.org/tiki-index.php?page=Asterisk+zapata+gain+adjustment
I was MOST DEFINITELY NOT wildly changing settings. It would require a
whole book to explain properly what I did but the end result was that I
pretty much covered every possible combination of settings. I have read the
white papers and EVERYTHING else I could find on the web to determine the
most logical and proper way to go about this. I was NOT approaching this
like some back yard six pack scientist.
I made a mistake when I used the word "levels" to describe what fxotune
does. The bottom line is that it did not change anything.
My settings are pretty much default except where I stated otherwise.
Network is a Linksys WRT54g (ie. Switch). Asterisk server on port 1,
GXP2000 on port 2, 9133i on port 3.
I have NO echo between SIP phones!
#cat /proc/pci
Bus 0, device 0, function 0:
Host bridge: Intel Corp. 82815 815 Chipset Host Bridge and Memory
Controller Hub (rev 2).
Prefetchable 32 bit memory at 0xd0000000 [0xd3ffffff].
Bus 0, device 1, function 0:
PCI bridge: Intel Corp. 82815 815 Chipset AGP Bridge (rev 2).
Master Capable. Latency=32. Min Gnt=12.
Bus 0, device 30, function 0:
PCI bridge: Intel Corp. 82801BA/CA/DB/EB PCI Bridge (rev 1).
Master Capable. No bursts. Min Gnt=6.
Bus 0, device 31, function 0:
ISA bridge: Intel Corp. 82801BA ISA Bridge (LPC) (rev 1).
Bus 0, device 31, function 1:
IDE interface: Intel Corp. 82801BA IDE U100 (rev 1).
I/O at 0xf000 [0xf00f].
Bus 0, device 31, function 3:
SMBus: Intel Corp. 82801BA/BAM SMBus (rev 1).
IRQ 11.
I/O at 0x5000 [0x500f].
Bus 1, device 0, function 0:
VGA compatible controller: ATI Technologies Inc Rage 128 RF/SG AGP (rev
0).
IRQ 10.
Master Capable. Latency=32. Min Gnt=8.
Prefetchable 32 bit memory at 0xd4000000 [0xd7ffffff].
I/O at 0x9000 [0x90ff].
Non-prefetchable 32 bit memory at 0xd9000000 [0xd9003fff].
Bus 2, device 1, function 0:
Unknown mass storage controller: PCI device 1095:3124 (CMD Technology
Inc) (rev 1).
IRQ 11.
Master Capable. Latency=32.
Non-prefetchable 64 bit memory at 0xdb008000 [0xdb00807f].
Non-prefetchable 64 bit memory at 0xdb000000 [0xdb007fff].
I/O at 0xa000 [0xa00f].
Bus 2, device 2, function 0:
Communication controller: Tiger Jet Network Inc. Intel 537 (rev 0).
IRQ 5.
Master Capable. Latency=32. Min Gnt=1.Max Lat=128.
I/O at 0xa400 [0xa4ff].
Non-prefetchable 32 bit memory at 0xdb009000 [0xdb009fff].
Bus 2, device 4, function 0:
Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL-8139/8139C/8139C+ (rev 16).
IRQ 10.
Master Capable. Latency=32. Min Gnt=32.Max Lat=64.
I/O at 0xa800 [0xa8ff].
Non-prefetchable 32 bit memory at 0xdb00a000 [0xdb00a0ff].
#cat /proc/interrupts
CPU0
0: 1290132 XT-PIC timer
1: 4 XT-PIC keyboard
2: 0 XT-PIC cascade
5: 12878920 XT-PIC wctdm
8: 1 XT-PIC rtc
10: 33866 XT-PIC eth0
12: 41 XT-PIC PS/2 Mouse
14: 17345 XT-PIC ide0
15: 60 XT-PIC ide1
NMI: 0
ERR: 0
-----Original Message-----
From: Andrew Kohlsmith [mailto:akohlsmith-asterisk at benshaw.com]
Sent: Wednesday, August 24, 2005 1:54 PM
To: asterisk-users at lists.digium.com
Subject: Re: [Asterisk-Users] Will Echo problems EVER be solved, I'm scared
On Wednesday 24 August 2005 16:37, canuck15 wrote:
> As others have recommended, I created a test system with the proposed
> production parts. I bought a couple different SIP phones to try and a
> Digium TDM01B card. I am using an older PIII 1Ghz system with
> 815chipset (PCI Rev2.2) with 256MB for my test system. The only thing
> that will be different on a production system is that I will be using
> a newer chipset PC with faster processor and 512MB. Probably Intel
> 7505, 7210, or 7211 chipsets which seem to be the most compatible with
Asterisk.
So in other words, everything will be changing on your production system.
Not a good way to start.
> My problem is that I cannot eliminate echo no matter what I try. I
> seriously doubt that a newer chipset faster PC with more memory will
> eliminate or even reduce my echo problems based on what I have read. I
am
> not about to drop more cash to try and find out. Essentially, my
> findings are that Asterisk is NOT production capable for my
> configuration which is via FXO and PSTN. That is probably THE most
> common configuration so if it is not production capable like that it
> isn't production capable period as far as I'm concerned. What a
disappointment :(.
Most of us don't have any trouble.
> *Buy latest TDM400P with latest FXO module *Ensure copper connection
> to analog telco lines and telco are not causing problems including
> running a separate shielded line to the demarc AND having the telco
> guy come out and test the levels, impedance etc.
I'd be damn curious to know what you got out of this -- most telco guys will
do a basic metallic check, throw on a butt-set and say "yup, I got
dialtone."
-- hardly a real check but that's neither here nor there. I'm also in
Canada (1.5hrs from Toronto, ON) so I'm *really* curious who you got on the
line to do a real line test with you. I have resorted to buying my own
telco test equipment off ebay and using that, even though our techs here are
excellent.
> *Adjust RX/TX levels as per Asterisk Wiki using the quick Ztmonitor
> method and by using the detailed Ztmonitor method via a Telco
> 102milliwatt test phone #. The end result was RX=8.0, TX=-1.0. Since
> I still have echo problems I have tried all sort of other settings without
success.
Ok good. Can you detail exactly what you did to reach these numbers? I'm
curious.
> *After ALL of the above, try every possible combination of all of the
> following on Asterisk v1.0.9: echocancel (off, on, 128, 256, 16, 32,
> 64), echowhenbridged (on, off), echotraining (off, on, 800), Mark 2
> (default, aggressive, CVS head developments, bugs.digium.com patches,
> adjust threshold level as per wiki etc. etc.)
I'd posted something earlier that basically says this: Without measured,
controlled tests, you're just pissing up a rope. Wildly changing settings
and hoping for the best does nothing but cost you time and energy.
> *Run fxotune which did not find a need to adjust the FXO levels
> (1=0,0,0,0,0,0,0,0)
fxotune doesn't adjust FXO levels, it adjusts a very simple FIR filter which
is part of the DAA in the FXO module. IMO it helps with audio quality but
not much with echo.
> Still have echo. Aggressive mode helps a bit but then the other
> persons voice get's cut off a lot especially when I talk and the
> cutting in and out of the canceller is more noticeable and
> objectionable in general than if Aggressive is turned off.
Agressive mode turns the phone line into a half-duplex environment. When
your voice energy is detected it mutes the receive audio.
> I have two SIP phones. An Aastra 9133i and a Grandstream GXP2000.
> Echo problem is the same on both phones.
Do you have echo between the two phones? What about when calling out to a
VOIP provider, dialing a DID you own that comes back in and hits the other
phone?
> Any comments and/or suggestions would be greatly appreciated as I am
> pretty much out of ideas and ready to give up on Asterisk as a
> suitable traditional small business phone system replacement.
I haven't seen your zconfig.h nor your zaptel Makefile, and you didn't tell
us anything about your network (network card, switch, etc.).
My general advice for zaptel is to do the following:
zaptel Makefile: underneath the comments about zconfig.h add
KFLAGS+=-march=pentium4 (or pentium3 or pentiumpro, use the exact proc)
CFLAGS+=-march=pentium4 (or pentium3 or pentiumpro, use the exact proc)
and in zconfig.h
- enable XLAW (optimize for small # of zap channels)
- enable MMX
- MARK2, no agressive mode.
Whenever I've done that my echo has largely disappeared.
Have you also tried flipping tip and ring going into the TDM card?
-A.
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