Con fecha 28/1/2006, "Jean-Michel Hiver" <[EMAIL PROTECTED]> escribió:
>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. > The lag if 1000 ~ 1500 ms >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. I don't have packet loss, but my BW is limited. > >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-user _______________________________________________ --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
