On Mon, 15 Jan 2007, O.Kamal wrote:

I am trying to connect 2 asterisk servers through OpenVPN, the VPN should
carry 16 channel, however when active channels reached 4 concurrent
channels, the connection became unstable, with a very high latency (around
900ms), the internet bandwidth is 1Mbps on each server, I have upgraded the
bandwidth to double it, but still have exactly the same problem.

Any tips or recommendations on such setup?

No real answers, but questions that might help ...

Have you tried it without using OpenVPN? Just port-forward the SIP & RTP ports, if you need to and give it a go.

I am using SIP and G729 between the 2 servers, openVPN using UDP with no
compression.

Why not IAX?

Are your openVPN end-points up to it? Doing high-grade encryption in software might challenge some slower processors - are the VPN endpoints the asterisk boxes themselves?

Gordon
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