On 10/02/2009 08:36 AM, Martin wrote: > if a user calling you hears echo of himself then it's the fault of > your sip device/sip phone. > The manufacturer must be using a cheap or an open source echo canceller ... > > try getting a different sip device made by some 'normal' company like > polycom or linksys/cisco > You might like to know that a number of people have used the open source OSLEC canceller to replace the rather broken one Linksys put in their ATAs. > Martin > > On Thu, Oct 1, 2009 at 9:10 AM, Myles Wakeham<[email protected]> wrote: > >> I have an Asterisk 1.4.2 system that has been installed for about 3 >> months now in our home. We converted all of our phones to SIP phones, >> and use two different trunk providers (BroadVoice for incoming& >> FlowRoute for outgoing). >> >> Most of the time its working flawlessly. But about 1/3rd of the calls >> that come into us complain of an echo and what is best described as >> latency issues. Its not consistent though. I was on the phone with an >> insurance company yesterday for about 1 hour and the call was perfect (I >> originated the call which used Flowroute for the SIP provider). >> >> What seems to be a pattern here is cell phones. When we receive a call >> from a cell phone, or from certain people on certain phone systems, they >> consistently complain of echo in the call. Its far less regular when we >> originate the call, which suggested to me that the problem might be with >> Broadvoice. But I'm now hearing that us calling back the party doesn't >> always solve the problem either. >> >> We upgraded our Internet feed (we're on a cable Internet through our >> cable company, with 12mb/s down, 1.5mb/s up) and that seems to have >> helped but not solved this problem. From what I can see, its some form >> of latency issue. We use IPCop as a firewall for our Internet access, >> but have turned off any IDS on it so that its running fast. I can play >> online computer games through the network with no issues at all, so I >> don't think its slowing down the traffic and if it was I'd expect this >> problem to be occurring consistently on all calls. >> >> Are there any tweaks that I can do with Asterisk to increase the network >> performance to reduce these issues? Have others who have experienced >> this been able to identify the issues to external VoIP SIP providers >> only, or does our system have something to do with all of this? At the >> time of the calls coming in, IPCop is telling me that we don't have more >> than 100K/s of bandwidth in use, and according to the network bandwidth >> graphs there, even with 2 people on the phone at the same time, the >> bandwidth never seems to exceed 300K/s, so I think we have plenty of >> headroom for this. I checked with our cable provider for issues with >> modem latency, and they couldn't detect anything. Again, I'm not >> experiencing any lag issues with computer games, particularly those that >> are heavy in interactivity, so I don't think that is the reason. >> >> Any suggestions as to what could be tweaked would be greatly appreciated. >> >> Steve
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