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 Martin On Thu, Oct 1, 2009 at 9:10 AM, Myles Wakeham <my...@techsol.org> 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. > > Myles > -- > ======================= > Myles Wakeham > Director of Engineering > Tech Solutions USA, Inc. > Scottsdale, Arizona USA > http://www.techsolusa.com > Phone +1-480-451-7440 > > > _______________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > AstriCon 2009 - October 13 - 15 Phoenix, Arizona > Register Now: http://www.astricon.net > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2009 - October 13 - 15 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
