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
