[asterisk-users] Two Connected Servers Sound Quailty
tim at mexuar.com
Sun Apr 29 03:55:43 MST 2007
On 28 Apr 2007, at 09:05, Matt Gardner wrote:
> Ok this is my first post and I will try to keep it short.
> I have searched everywhere and haven't found an answer to my question
> I have two Trixbox servers that are connected over the Internet via
> an IAX2 connection. We are experiencing very poor sound quality.
> I have tried many different codecs gsm, ilbc, g729, g711 and all
> seem to have the same problem. (All though g729 seems to work the
> best but still isn't reliable) The problems are intermittent
> sometimes the sound will cut out for 3-4 seconds and other times
> the sound will just be loosing every other word, and other times it
> sounds just fine.
> Also, we have been using Skype over this same Internet connection
> and have very good sound quality with very few lost words.
> So here are my questions.
> First, is it a correct assumption to say that because Skype works
> well over this connection then I should be able to get asterisk to
> work over this connect. I am hoping that Skype isn't "better" then
> asterisk in this area.
> If I should be able to get the same sound quality could you point
> me in the right direction on how to achieve this. (I have tried
> messing with the jitterbuffer but haven't been able to find very
> good docs on how to utilize this functionality so about all I have
> done is set jitterbuffer=yes)
Try making a call, and then use iax2 show netstats
(I think that is the syntax in 1.4, I'm off-line at the moment and my
memory is going :-( )
This will give you some statistics collected by the jitterbuffer code.
Post them here and we will take a look.
As a reference point, we get _perfect_ g711 calls over IAX from the
UK to new york, so it is possible.
Theoretically Skype _can_ produce better audio quality than asterisk
as it supports a wideband codec
but in practice asterisk/iax should be just as good and somewhat
more predictable as Skype's routing
varies from call to call.
More information about the asterisk-users