[Openvpn-users] openvpn and voip

["Eric \"Skippy\" Hope" <ehope@xxxxxxxxxx>]

Hi all,

I'm hoping that someone has a clue that they can spare.

We're trying to use openvpn to secure voice over ip sessions from a 
software phone on a windows box and the voip server.  The openvpn part 
works beautifully (and is a joy to work with compared to other vpn 
techs).  The problem comes in when trying to make a call.  The session 
initiation portion of the call goes over the vpn just like it should 
(this is the sip portion, for those familier with voip).  Once the other 
end picks up the phone, the software phone tries to send the actual 
voice connection over the public IPs, ignoring the vpn.  This seems to 
have something to do with the Win TUN/TAP interface.

windows.ovpn file:

client
dev tun
proto udp
remote re.mo.te.ip 1194
resolv-retry infinite
persist-key
persist-tun
ca "path\\to\\crt"
cert "path\\to\\crt"
key "path\\to\\key"
comp-lzo
verb 5
tun-mtu 1500
tun-mtu-extra 32


It seems like the softphones (and we've tried 3 or 4, all showing the 
same behavior) are picking the ethernet interface by default somehow.  
Is there an option either on the client or server end to influence how 
it routes traffic?  We've tried redirect-gateway and the traffic does 
use the vpn, but the client machine becomes unusable due to dhcp problems.

Hoping for a clue,

Eric

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