Hi list, i'm having a problem with asterisk+pstn termination, i just bought a TDM400p and connect my phone line(bellsouth) now when im using the pstn through asterisk there's an echo, i don't know if this is already have been resolved. If it does please point me to the instruction how to resolve this. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20051026/19a88540/attachment.htm
Matthew Fredrickson
2005-Oct-26 14:09 UTC
[Asterisk-Users] asterisk using tdm400p has echo
On Oct 26, 2005, at 3:40 PM, Mark Quitoriano wrote:> Hi list, i'm having a problem with asterisk+pstn termination, i just > bought a TDM400p and connect my phone line(bellsouth) now when im > using the pstn through asterisk there's an echo, i don't know if this > is already have been resolved. If it does please point me to the > instruction how to resolve this.Try reading README.fxotune and using fxotune to see if it improves it. Also make sure that you're using the latest version of zaptel (with the KB1 echo canceler). If that still gives you echo, try using the patch for bug 5520 and change your echo canceler to that to see if it improves your echo. Matthew Fredrickson
> Hi list, i'm having a problem with asterisk+pstn termination, i just bought > a TDM400p and connect my phone line(bellsouth) now when im using the pstn > through asterisk there's an echo, i don't know if this is already have > been resolved. If it does please point me to the instruction how to > resolve this.Yes, but only a couple hundred times or so (check the archives). What version of asterisk are you running (cvs-head, stable, 1.2)? Might start with something like this in your zapata.conf: [channels] language=en ; the following added to handle callers that hang up on VM. busydetect=yes busycount=6 cidsignalling=bell cidstart=ring callerid=asreceived context=inbound-bus-dialin signalling=fxs_ks echocancel=yes echotraining=800 echocancelwhenbridged=yes rxgain=3 txgain=0 musiconhold=default channel => 1 You'll need to play with rxgain & txgain for "your" implementation as the value used is specific to how far your asterisk system is from the central office. You might start with high values (eg, 5) and reduce the values until the echo is minimal. Remember, changes to zapata.conf "requires" a complete restart of asterisk, not just a reload. If you go too low, dtmf will fail and talking with anyone via the pstn will be difficult at best.
I had to turn on the aggressive echo cancellation in the zaptel drivers for mine. Which is much better, but we still get occasional pops. The funny part is only the asterisk side of the connection hears the echo. Jared Armstrong -----Original Message----- From: Rich Adamson [mailto:radamson@routers.com] Sent: Thursday, October 27, 2005 8:22 AM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [Asterisk-Users] asterisk using tdm400p has echo> > > Hi list, i'm having a problem with asterisk+pstn termination, ijust> > > bought a TDM400p and connect my phone line(bellsouth) now when im > > > using the pstn through asterisk there's an echo, i don't know ifthis> > > is already have been resolved. If it does please point me to the > > > instruction how to resolve this. > > > > Try reading README.fxotune and using fxotune to see if it improvesit.> > If you do an fxotune and all of the coefficients are 0, does this meanthat fxotune is not making> any changes? > > I've got 6 lines that are coming from a channel bank into two TDMcards and have significant> echo, even with Asterisk HEAD and KB1. I just ran fxotune, and all 6lines came back with all> 0's in fxotune.conf...Based on what Matt has mentioned previously, fxotune only sets the impedence to proper values today. He has not implemented the code to set the coefficients as yet, therefore the expected values are zero's.