I'm trying to simulate the situation: SIP <----> Asterisk <-------> PSTN
In this case 16 ms works? I've read in voip-info: "Simplistically, you'd need a "tail circuit" (the distance between your echo canceller and the source of the echo) of over 2500 miles to acheive an echo path of 30ms [...] Asterisk's default of 128taps will therefore handle echo paths of up to 16ms, and is therefore probably good for most things.". 2011/9/14 Kevin P. Fleming <kpflem...@digium.com> > On 09/14/2011 10:14 AM, Eric Wieling wrote: > >> If I read Kevin's post correctly, his statement applies to ALL echo >> cancellers, not just software EC. >> > > That's correct; regardless of whether the EC runs on a DSP or on the host > CPU (or is a device in the path of an T1/E1 circuit), if it can only handle > a 16ms window for echo cancellation, then having a packetized 'hop' in the > audio path is likely to make it unable to do its job at all. > > Echo cancellers used on networks where packetized audio is transported > through at least one hop need to be configured for (at least) 64ms windows, > if not 128ms. > > > -- > Kevin P. Fleming > Digium, Inc. | Director of Software Technologies > Jabber: kflem...@digium.com | SIP: kpflem...@digium.com | Skype: kpfleming > 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA > Check us out at www.digium.com & www.asterisk.org > > -- > ______________________________**______________________________**_________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > New to Asterisk? Join us for a live introductory webinar every Thurs: > http://www.asterisk.org/hello > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > > http://lists.digium.com/**mailman/listinfo/asterisk-**users<http://lists.digium.com/mailman/listinfo/asterisk-users> > -- Atenciosamente, Gustavo Santos.
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