[Asterisk-Users] VPN's

[Armin Schindler]

On Fri, 15 Jul 2005, Peter Osborne wrote:
> Hi All,
> 
> I'm using Asterisk for my PBX, I have a remote office that is connected by a 
> VPN link. I am using Openswan on my side and a Linksys box on the remote 
> side. I have a Polycom IP300 on the remote side configured with a static IP 
> address. When I call the phone on the remote side, it rings and establishes 
> the call fine. The problem I am having is that the remote side can hear the 
> call find but the local side hears nothing. Because of the VPN there are no 
> firwalls in the way. Does anyone have some ideas or atleast how I can track 
> down the problem.

I had the same problem with VPN using 'netscreen' (or a similar name) boxes.
When I switched from SIP to IAX protocol, it worked perfectly.

I think the SIP voice UDP packets are blocked somehow, but I didn't 
investigated it further.

Armin