[Freeswitch-users] TOS / DSCP marking in FreeBSD?

Hello, Does anyone know how to make Freeswitch mark outgoing SIP and RTP packets with appropriate TOS or DSCP values? Most other software does this when it creates the packets but Freeswitch sends everything as 0x0 I found some great examples on the Wiki on doing this with IPTABLES in Linux, but that doesn't apply to FreeBSD We can use IPFW or PF, but I can't find any information there on re-marking. Everything in those packages seems to relate to using the marks, but not setting them. Thanks! -Tim