SIP Trunks and Prioritization

Hello all,

I am going to have SIP trunk traffic on ports 1 (PBX) & 2 (firewall) on my 6428.  I know the SIP traffic is going to have a DSCP value of 46.  Any one got any tips on how to setup those two ports to make sure "46" traffic gets the highest priority?

This is a brand new switch with the default config.

The PBX will be the only device sending VoIP traffic.  No IP phones will be used.

Thanks for any info you can provide!

Jamie