Hi, Eric.

There are a couple of places for this.

First, some VoIP uses a ToS setting in the DSCP field of the packet. This can be configured in the Engine Settings, ToS / DSCP Header byte. You'll want to look at your VoIP stream to see what's being used there.

Another thing you can do is to capture a VoIP packet and use that for the Cargo of your packet. This option will fill the packet with data of your choosing to more closely simulate the application you're using. This is configured in the same area (Engine Settings), in "Advanced cargo options".

We don't currently have any specific recommendations on values you can use here. You can use something like WireShark (used to be Ethereal) to capture your packets, and then use the captured data to build a Cargo and DSCP value that makes sense for your application packets.

- Pete