[Asterisk-Users] Will Echo problems EVER be solved, I'm scared

[Alfredo J. Fabretti]

Try to use another land line and test the echo problem again.
Do you have any DSL service running in that line?


Quoting canuck15 <canuck15 at hotmail.com>:

>
> I came into this with my eyes wide open.  I have read ABSOLUTELY EVERYTHING
> there is to be found on the net about avoiding echo problems BEFORE I even
> attempted to create a production system.  Since lots of people are
> apparently using this in production environments now I just assumed that
> echo IS avoidable.
>
> 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.
>
> 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 :(.
>
> Unless I am missing something I am sure that many many people with a similar
> configuration in a production environment have the same problem.  Perhaps
> they are just living with it??  For me it is just as unacceptable on an
> Asterisk system as it is on a traditional PBX.  Some calls are ok and some
> are not.  No correlation to local, long distance, time of day.  There always
> seems to be some echo.  Sometimes it is worse than other times.  Again, no
> correlation to local, long distance, time of day.  Tried connecting to ATA
> adapter and using VoIP provider instead to see if the telco was causing the
> problem.  That did not change anything.  Still the same general echo problem
>
> The things I have tried include in no particular order and not limited to
> are:
>
> *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.
> *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.
> *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.)
> *Make sure echotraining line is before FXO channel assignment in zapata.conf
> file
> *Run fxotune which did not find a need to adjust the FXO levels
> (1=0,0,0,0,0,0,0,0)
>
> Based on all the above testing the best settings were pretty much in line
> with what most people are finding.
> echocancel=on. echowhenbridged=on, echotraining=800, Mark 2 echo canceller,
> aggressive cancellation OFF, bugs.digium.com #2820 patch, RX=8.0, TX=-1.0.
>
> 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.
>
> I have two SIP phones.  An Aastra 9133i and a Grandstream GXP2000.  Echo
> problem is the same on both phones.
>
>
> I am located within a metropolitan area in Canada.
>
> 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.
>
>



-- 
Alfredo J. Fabretti
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