I thought the same thing before I made my reply but zapata.conf seems to be the only config file that deals with echo at all. From what I understand of 'echotrain' is that at the beginning of the call it sends a short signal out that measure echo in an attempt to try and cancel it. I was wondering if you tried using it and if so was it of any help? Sincerely, Steve But is Zapata.conf even in the picture when all calls go through a SIP-provider, since the calls are not being routed through a ZAP channel? Regards, Bjorn -----Opprinnelig melding----- Fra: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com] P? vegne av steve Sendt: 22. mars 2006 23:11 Til: asterisk-users@lists.digium.com Emne: [Asterisk-Users] re: Sound issues on SIP-SIP calls When you hear echo its actually being caused by the other phone. check your zapata.conf file and see if echotraining=yes. Echo can be caused by lots of things so this is just a starting point. For several months now we?ve been experiencing a really strange problem with sound which best can be explained as choppy/stuttery, and with a touch of echo on top. Basically, parts of a conversation might be choppy, but often combined with some echo as well. The sound problem can only be heard by us, not by the other party. But this is the strange part:
The echo statements in zapata.conf apply "only" to zap channels; nothing at all to do with sip channels. The echotraining=800 statement essentially sends a pulse 800 milliseconds after a pstn line has been grabbed by asterisk, and measures the reflected energy. That value is used to preload the echo canceller (on zap pstn calls) allowing the echo canceller to train quicker. steve wrote:> I thought the same thing before I made my reply but zapata.conf seems to > be the > only config file that deals with echo at all. From what I understand of > 'echotrain' > is that at the beginning of the call it sends a short signal out that > measure echo > in an attempt to try and cancel it. I was wondering if you tried using > it and if so was it of any help? > > Sincerely, > Steve > > But is Zapata.conf even in the picture when all calls go through a > SIP-provider, since the calls are not being routed through a ZAP channel? > > Regards, > Bjorn > -----Opprinnelig melding----- > Fra: asterisk-users-bounces@lists.digium.com > [mailto:asterisk-users-bounces@lists.digium.com] P? vegne av steve > Sendt: 22. mars 2006 23:11 > Til: asterisk-users@lists.digium.com > Emne: [Asterisk-Users] re: Sound issues on SIP-SIP calls > > When you hear echo its actually being caused by the other phone. check > your zapata.conf file and see if echotraining=yes. > Echo can be caused by lots of things so this is just a starting point. > > For several months now we?ve been experiencing a really strange problem > with > sound which best can be explained as choppy/stuttery, and with a touch of > echo on top. Basically, parts of a conversation might be choppy, but often > combined with some echo as well. The sound problem can only be heard by us, > not by the other party. But this is the strange part: > > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com -- > > Asterisk-Users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users
Eric "ManxPower" Wieling
2006-Mar-24 17:28 UTC
SV: [Asterisk-Users] re: Sound issues on SIP-SIP calls
Asterisk only supports echocancel on PSTN (zap) interfaces. Echo needs to be canceled out at the PSTN<->VoIP interface. Calls that are all VoIP can't have echo. If they have echo then you can, with confidence, blame the SIP phone. Here's another example: Analog Phone -> SIP ATA -> Asterisk -> SIP Phone The SIP ATA should be the device canceling out the echo. steve wrote:> I thought the same thing before I made my reply but zapata.conf seems to > be the > only config file that deals with echo at all. From what I understand of > 'echotrain' > is that at the beginning of the call it sends a short signal out that > measure echo > in an attempt to try and cancel it. I was wondering if you tried using > it and if so was it of any help? > > Sincerely, > Steve > > But is Zapata.conf even in the picture when all calls go through a > SIP-provider, since the calls are not being routed through a ZAP channel? > > Regards, > Bjorn > -----Opprinnelig melding----- > Fra: asterisk-users-bounces@lists.digium.com > [mailto:asterisk-users-bounces@lists.digium.com] P? vegne av steve > Sendt: 22. mars 2006 23:11 > Til: asterisk-users@lists.digium.com > Emne: [Asterisk-Users] re: Sound issues on SIP-SIP calls > > When you hear echo its actually being caused by the other phone. check > your zapata.conf file and see if echotraining=yes. > Echo can be caused by lots of things so this is just a starting point. > > For several months now we?ve been experiencing a really strange problem > with > sound which best can be explained as choppy/stuttery, and with a touch of > echo on top. Basically, parts of a conversation might be choppy, but often > combined with some echo as well. The sound problem can only be heard by us, > not by the other party. But this is the strange part: > > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com -- > > Asterisk-Users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >