I have a user that complains of echo for the duration of a ZAP-SIP call. I have experienced it too, but it only happens randomly. Is there any way to debug the echo cancellation other than doing a zap show channel X? I am using a T100P --> Adtran 750. Has anyone done anything to successfully stop echo with the Adtran 750? In my Zapata.conf file I am using echotraining and echocancel=yes. I also am using rxgain=-2.0. Thanks in advance, Brent D. Franks Mindworks Internet Services
> I have a user that complains of echo for the duration of a ZAP-SIP call. > I have experienced it too, but it only happens randomly. > > Is there any way to debug the echo cancellation other than doing a zap > show channel X? > > I am using a T100P --> Adtran 750. > > Has anyone done anything to successfully stop echo with the Adtran 750?Yup inline T1 hardware echo cans :) I am using some older 64ms T1 tellabs 2572's, stops echo in its tracks
Interesting, how do you configure T1 Tellabs 2572's? We also have same issue and I am tried resolving this echo issue. I did some google search but didn't find any details, about how to configure between Adtran 750 and T100P. If you have already done, please give us some details. Regards, KD Date: Wed, 17 Mar 2004 15:52:09 -0800 From: TC <trclark@shaw.ca> Subject: Re: [Asterisk-Users] Random Echo To: asterisk-users@lists.digium.com Reply-To: asterisk-users@lists.digium.com> I have a user that complains of echo for the duration of a ZAP-SIP > call. I have experienced it too, but it only happens randomly. > > Is there any way to debug the echo cancellation other than doing a zap > show channel X? > > I am using a T100P --> Adtran 750. > > Has anyone done anything to successfully stop echo with the Adtran > 750?Yup inline T1 hardware echo cans :) I am using some older 64ms T1 tellabs 2572's, stops echo in its tracks
TC, Appreciated your help and will try out TelLabs card and see if we can get rid of echo. Yesterday I did some changes in TX and RX attenuation setting on Channel bank and it reduces the echo, but it is not yet vanished as we wanted. Any way Thanks. Regards, KD Date: Wed, 17 Mar 2004 19:47:16 -0800 From: TC <trclark@shaw.ca> Subject: Re: [Asterisk-Users] Re: Random Echo To: asterisk-users@lists.digium.com Reply-To: asterisk-users@lists.digium.com>I did some google search but >didn't find any details, about how to configure between Adtran 750 and >T100P. If you have already done, please give us some details.not sure what level of dtl you want its quite straight fwd It varies depending on the chasis but in general there are T1 in and T1 out DB-15's for each T1 circuit you want to echo cancel. A straight T1 rj-45 cable goes to the channel bank other end is db-15 in to Tellab then a T1 X over goes from the Tellab db-15 out to the T100p card Then there are external Mode and Chan switchs that allow you to configure the T1 circuit (the line bld, framing, and coding/signaling), and then other setting to allow channels FXO/FXS LS, GS and enable echo cancel channel by channel, I do it for all fxs/fxo ports and turn ALL * echo cancel in zapata OFF..