[asterisk-users] IAX best practices

[Steve Totaro]

Asterisk wrote:
> Thanks Steve!
>
> What are usually the best approaches in troubleshooting the audio
> quality issues and QoS related stuff when putting two Asterisk boxes
> together via IAX?
>
> Have you ever tried connecting Asterisk boxes in the same VPN (but still
> in different countries)?
>
> Regards,
> Alex
>
>   
Alex,

VPN will only help in keeping your data more secure.  It will actually 
hurt your latency and throughput since there is processor overhead 
involved in encrypting/decrypting and and bandwidth in encapsulating the 
data.

As I said before, audio issues with voice breaking up are usually 
indicative of not enough bandwidth and delay (sometimes echo) is cause 
by latency.  Unless your carrier offers QoS end to end, there is very 
little you can do about it except on your little piece of of the 
network.  You can always buy more bandwidth though.

How big is the pipe and what are your ping times (through the VPN and 
over the public internet)?

Thanks,
Steve