[asterisk-users] Could two Asterisk servers connect through VPN

[Gordon Henderson]

On Mon, 7 May 2007, Tielin Xu wrote:

> Hi list:
>
> Has anyone done to set up two servers in different remote offices
> through VPN
> in order to get the VoIP communication?

Yes it will work, but depending on your hardware you might be better off 
not using the VPN and just using an IAX trunk over the public Internet 
(unless you're really paranoid about someone listening in)

If you have a VPN with good hardware - eg. something with a hardware 
encryption engine, you'll be just fine. Beware the cheaper routers with 
software VPNs built in - they are rate limited due to the weedy processors 
in them and you may find that the processor may take longer or shorter 
time to encrypt different packets which will affect jitter. I found this 
with Drayteks anyway. Even though there was plenty of bandwidth, under 
load things didn't look right (this was actually between 2 polycom video 
units 9000 miles apart - California/England) turn the encryption off and 
it was perfect, or move to a router whith hardware encryption and it was 
also perfect.

You get what you pay for...

Good luck!

Gordon