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 <[EMAIL PROTECTED]> 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 Users > 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 (IPTEL). This way the > speakers > 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 PSTNs 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 > [EMAIL PROTECTED] > > 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.> _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com > -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > > http://lists.digium.com/mailman/listinfo/asterisk-users > ____________________________________________________________________________________ Sponsored Link Try Netflix today! 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