OpenVPN and QoS/TOS

[roelvanmeer]

Hi!

If you connect a Yealink phone via OpenVPN, is there a way to set the QoS flags also on the openvpn packets? I know it is possible to set QoS on the audio packets, but if these are tunneled via openvpn, the openvpn packets don't have a QoS flag set.

OpenVPN has the option "passtos", which ensures that the TOS field of an encapsulated audio packet is copied to the encapsulating openvpn packet. Setting this on the openvpn server works like a charm for audio traffic from the openvpn server to the phone, but setting it in the client config doesn't seem to have any effect: although the tunneled audio packets have their TOS field set, the openvpn packets don't.

So, I would like to know if it is possible to set the TOS field of openvpn packets originating from the phones? I'd be grateful for any tips.

Thanks in advance,

Roel