[asterisk-users] Audiocodes MP-114 noise

Wed Nov 8 09:18:25 MST 2006

Jason,

I think it's something only supported in the newer firmware. Get in  
contact with the place you bought the unit from, they should be able  
to get the latest firmware for you.

>> MP118_SIP_F4.80A.034.004.cmp should work for MP114, this is what  
>> we used and all that we could get from Audiocodes, I think they  
>> should have named it MP11x though. :)

Jessee Holmes
Atacomm / Ataractic Corporation
www.atacomm.com
V: 1-877-700-VOIP
jholmes at atacomm.com

Looking for voice over IP products?  Visit our VoIP store at http:// 
voipstore.atacomm.com/

On Nov 8, 2006, at 2:25 AM, Jason Kim wrote:

> Jessee,
>
> Thank you for your help.
> I downloaded firmware and sample configuration files.
> But the firmware was old version for MP118 and MP124.
> Where can i download recent one?
> Can i upload only ini file to change
> countrycoefficient ?
>
> Regards,
> Jason.
>
> --- Jessee J Holmes <jholmes at atacomm.com> wrote:
>
>> Jason,
>>
>> First, before you start reading, get to the latest
>> firmware from
>> Audiocodes (MP118_SIP_F4.80A.034.004.cmp), there
>> have been
>> significant echo improvements in this version.
>>
>> After many days of working with Audiocodes on this
>> problem and much
>> time spent here by multiple technicians trying to
>> reproduce and
>> resolve this issue; this morning, Atacomm received
>> an email from
>> Audiocodes with a full explanation to this now
>> confirmed issue with
>> all MP-11x units. Atacomm will immediately begin
>> work on a KB article
>> within our website that confirms this issue and
>> outlines the
>> manufacturer recommended steps to resolve this
>> problem.
>>
>> Apparently, there have been some changes with the
>> MP-11x's that can
>> negatively affect line noise and echo.  Below are
>> some steps which
>> can help to correct these problems:
>>
>> 1. The new design did away with the Coefficent file.
>>  Audiocodes, now
>> instead, introduced a configurable parameter called
>>
>> countrycoefficient. This parameter can be adjusted
>> to a specific
>> country based on known configurations.  For the most
>> part this should
>> work.  70(USA) is the default value.  More can be
>> found in the User’s
>> manual.
>>
>> 2.  In just about every case, an FXO is added to a
>> Pre-existing PBX
>> or CO line, you can expect echo. This comes from the
>> fact that delay
>> (IP Network) is being introduced, and what used to
>> be Side tone is
>> now delayed so much it is echo. Just about every
>> difference on the
>> line that can be heard between the pre fxo and post
>> fxo installation
>> can be traced to echo, or line quality issues.
>>
>> 3.  Going forward, Audiocodes would like to suggest
>> that when
>> installing the product do the following:
>>
>> A) Make sure the Line coming from the PBX or CO is a
>> Loop Start line.
>> Ground start is not supported on the MP-11x series
>> of gateways. (The
>> M1K FXO will in 5.0)
>>
>> B) Check that the Line can deliver for a 600 Ohm
>> Impedance line
>>
>> -52 to -24 V of Off Hook Voltage
>>
>> -15 to -6 V of  On Hook Voltage
>>
>> 20 to 35 ma of loop current.
>>
>> If you know the line is not 600 Ohm, please gather
>> metrics on the
>> line, and the make and model of the PBX or switch it
>> is attached too,
>> plus country of origin. If it is not from the USA,
>> please look up the
>> country of origin and then find the
>> CountryCoefficient to match this.
>> Load the .ini file to the board with this setting
>> and reset.  Make
>> sure the Gateway has a firmware version of 4.60.035
>> or higher or
>> 4.80.030 or higher.
>>
>> C) Put the device on the network with Voice Volume
>> set to 0 and input
>> gain set to 0. Make calls, if there is no issue, you
>> can stop here.
>> However, Echo is still expected most of the time.
>>
>> D) The echo should be heard by the IP side
>> participant as their voice
>> is reflected back.  If this is the case, then what
>> needs to be done
>> is to lower the voicevolume (IP—TEL). This way the
>> speaker’s
>> reflected voice will comeback low enough for the
>> ECAN to cancel it
>> out (-6 is usually recommended as the value to plug
>> in here). A
>> little experimentation is needed as the loss for all
>> lines will vary
>> based on length from the CO. Echo is usually taken
>> care of in this
>> manner.
>>
>> E) The incoming speaker from the PSTN’s voice seems
>> low, set
>> InputGainLocation =1, and then slowly increment the
>> Input Gain
>> Parameter(Tel?P) to adjust for this. In past
>> releases (see the note
>> about loads above), the input gain was always
>> applied prior to the
>> ECAN which had the effect of amplifying the returned
>> echo and noise
>> on the line causing crosstalk and clipping issues.
>> This is no longer
>> the case.
>>
>> If the above does not resolve the issues, then you
>> need to go ahead
>> and collect DSP, Ethereal and Syslog traces along
>> with the board.ini,
>> these are to be sent to your support agent, who will
>> then send these
>> to Audiocodes for their engineers to evaluate.  This
>> should not
>> happen often.
>>
>>
>> Jessee Holmes
>> Atacomm / Ataractic Corporation
>> www.atacomm.com
>> V: 1-877-700-VOIP
>> jholmes at atacomm.com
>>
>> Looking for voice over IP products?  Visit our VoIP
>> store at http://
>> voipstore.atacomm.com/
>>
>> On Nov 3, 2006, at 12:14 AM, Jason Kim wrote:
>> Jessee,
>> I tried many combinations of "Voice Volume", "Input
>> Gain" and packetization time , but it's noisy steel.
>> I'm using G.711A-law and packetization time is 20ms.
>> It can be impedance mismatch problem but i cannot
>> adjust impedance of FXO port of MP-114.>
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