Indeed there are! - John On Thu, 2009-10-01 at 20:18 -0500, Martin wrote: > Are you saying there are half duplex phones out there ???? with half > duplex speakerphones ? > > All analog phones are full duplex ... > > Anyways the echo can be created by the analog phone even when it's > connected to the > sip ata or even the sip phone ... then you usually have acoustic echo > which goes from speaker > to microphone of the handset ... that should be cancelled by the sip > phone/device... or someone out there will > hear echo > > Martin > > On Thu, Oct 1, 2009 at 7:57 PM, John A. Sullivan III > <jsulli...@opensourcedevel.com> wrote: > > I'm quite new to all this but I was under the impression that most > > electrically induced echo was at the physical interface to the PSTN. If > > one is using SIP trunking, I would think this would point to a carrier > > issue. > > > > We also hit an interesting problem with echo today but I don't think > > this is the issue Myles is having. We installed fairly high end phones > > with full duplex speakerphones. Callers are having a bad problem with > > echo when the users use the speakerphone. Because it is full duplex > > rather than half, if the speakerphone volume and speakerphone mike > > volume are turned up, the callers are indeed hearing themselves by > > virtue of the higher quality full duplex! > > > > On Thu, 2009-10-01 at 19:36 -0500, 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 > >> > >> 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 > > -- > > John A. Sullivan III > > Open Source Development Corporation > > +1 207-985-7880 > > jsulli...@opensourcedevel.com > > > > http://www.spiritualoutreach.com > > Making Christianity intelligible to secular society > > > > > > _______________________________________________ > > -- 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 -- John A. Sullivan III Open Source Development Corporation +1 207-985-7880 jsulli...@opensourcedevel.com
http://www.spiritualoutreach.com Making Christianity intelligible to secular society _______________________________________________ -- 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