You need to use the 'over' codec. It has been used for years with half-duplex conversations.
OVER ..... > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Jean-Michel Hiver > Sent: Saturday, January 28, 2006 1:45 PM > To: Asterisk Users Mailing List - Non-Commercial Discussion > Subject: Re: [Asterisk-Users] Best CoDec for high network latency > > Guillermo Salas M a écrit : > > >Hi, > > > >I need to have some SIP extentions on remote places where > the latency > >from my asterisk box with public ip is 1~1.5 seconds. > > > >What codec will work fine on this sceneary? I'm planning to > use iLBC, > >is a good choice? > > > > > There are basically three parameters I can think of when > speaking of voice over ip quality: > > 1 - Lag. In your case, a ping from your Asterisk box is 1 to 1.5 ms. > Changing codecs is not going to help you here. > > 2 - Jitter. In your case, if the ping does vary between 1 and > 1.5, that's 500ms "ping jitter", which is high. You might > want to have a large jitter buffer to compensate for it. But > this increases lag even more... > > 3 - Packet drop. iLBC is meant to cope "better" with packet > drop than other codecs, although in my experience any codec > with too much packet drop will sound dreadful. > > If you have the bandwith and no packet loss, I would > recommend that you bump up the jitter and stick with ulaw. > While there might be a lot of lag - "half duplex" kind of > conversations... - the audio should remain clear. > > If you are having packet loss on top of this, you might want > to try iLBC... > > At any rate, nothing is going to replace trying out some > settings for yourself... > > BTW: How come the latency is so high? The worst I've seen so > far was a link varying between 600 and 1200ms and the quality > varied from "good enough" to "pretty horrible"... > > Cheers, > Jean-Michel. > > -- > Jean-Michel Hiver - http://ykoz.net/ > Découvrez la Réunion des Technologies IP & Telecom > TEL: +262 (0)262 55 03 98 - RCS 434 273 330 SAINT PIERRE > > > _______________________________________________ > --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 > _______________________________________________ --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
