[Asterisk-Users] PRI and echocancel

[Rich Adamson]

> I have a crossover PRI(Asterisk server to PBX) and a regular telco PRI T1
> line and currently have echocancel=yes and echocancelwhenbridged=yes on
> those spans in zapata.conf. I was discussing CPU load with another Asterisk
> user and he mentioned that PRIs don't need echo cancelation and that turning
> it off will reduced CPU load on the server. I checked many sample configs
> and the archives and noticed that half of the people have echocancel on for
> PRIs and half do not. I checked the Digium site and indeed in the FAQ they
> say: "There should also be no echo on PRI connections". 
> 
> Does it really matter that much in terms of CPU usage and will it hurt at
> all if I turn it off for the crossover PBX connection or the telco PRI that
> I have? 

I recall working with someone that had echo on their pri, and turning it
one resolved his issue. Play with it to see what impact it has on your
case.