You might also want to read up on what the Wiki has to say though I suspect you have already exhausted this route.
http://www.voip-info.org/wiki/view/Causes+of+Echo http://www.voip-info.org/wiki/index.php?page=Asterisk+echo+cancellation The one thing thats significant in the above pages is that latency can be a significant factor and tuning Asterisk for more "taps" may help. Also, the echo may be worse with poor handsets so swapping them to see if there is a difference may lead you down the right path. John On Tue, 2005-11-08 at 17:58 -0500, Bjorn Asmul wrote: > Hi Philip, > > Also make sure you have the following lines in iax.conf: > > jitterbuffer=yes > dropcount=1 ; ...to drop at most 0.5% of VoIP packets > > Also make sure you provisioned it using ULAW (not ADPCM). > It can easily be verified by adding these lines in iax.conf: > disallow=all > allow=ulaw > > ...and don't allow any other codecs. > > With 120 ms latency you might not get away the echo either way... > > Our IAXy customers does not experience any echo with this setup, but it > might not be of importance in this case, since their latency is not that > high. > > Bjorn Asmul > AtlasVoice > www.atlasvoice.com > > -----Original Message----- > From: Stephan Monette [mailto:[EMAIL PROTECTED] > Sent: Tuesday, November 08, 2005 5:20 PM > To: 'Philip Mullis' > Cc: [email protected] > Subject: RE: [on-asterisk] Iaxy issues > > Philip, > > Make sure you are testing with good quality phones and without headsets. > Don't test with any cordless/wireless phone or headsets. > > I've seen a problem where a customer was using a Plantronic wireless > headset and was complaining about echo on our network. I got him to use > the phone's handset instead of the headset and the problem was gone!!!! > > Good luck, > > Stephan Monette > Unlimitel inc. > Tel.: 1 (877) 464-6638, x221 > Fax.: (613) 443-7773 > > -----Original Message----- > From: Philip Mullis [mailto:[EMAIL PROTECTED] > Sent: Tuesday, November 08, 2005 2:37 PM > Cc: [email protected] > Subject: [on-asterisk] Iaxy issues > > After much battle over email and even a tech support call to digium > which they in tern said sorry we cant figure it out but we will sell you > a support pakage and have a support level above us figure it out. I am > brutally angry with digium especially since I am a reseller and have > sold alot of there gear. > > So if anyone can help me figure out the problem stated below that would > be most appreciated by the many people out here with Iaxys > > There problem is there is occasionally mild to really bad echo. > this has nothing to do with the pstn , this portion has been debugged to > death secondly it happans when there is an iaxy to iaxy call, so this > dosnt even touch the pstn !!!! ive checked latencys and they all seem to > be 120ms and less 120 being the worst, jitter is usually non exsistent > to 0003ms so that is absolutly nothing. > The system is using the latest asterisk as of a few days ago 1.0.x > branch and is an amd 2800+ running on centos 2.6 > > Can anyone please point me in the direction to fix this issue before i > just blacklist digium hardware. > > Thanks, > A very frustrated Phil > MassiveTel > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] For additional > commands, e-mail: [EMAIL PROTECTED] > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] For additional > commands, e-mail: [EMAIL PROTECTED] > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > -- John Lange OpenIT ltd. www.Open-IT.ca (204) 885 0872 VoIP, Web services, Linux Consulting, Server Co-Location
