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Beginner

VoIP service-policy when using subinterfaces

Hi Guys.

I'm looking to setup a service policy to protect upstream VoIP traffic through a VPN, however i'm using sub interfaces on the outside interface and I believe its therefore not possible.

To summarise the configuration;

The interface "outside" has 5 subinterfaces for 5 distinct internet connections.

The interface "inside" is normally configured and connects directly to the office

The VPN is connected from the outside interface to the remote site.

My idea was to apply a service policy to the outside and protect the VoIP traffic on egress / VPN, however I believe service-policy cannot be applied to subinterfaces.

Can anyone think of an alternate configuration option? Could I protect the traffic as it enters the inside? Does this provide the same policy options?

Thanks.

Mike