Siproxd - give priority to outbound proxy

[xibalba]

hello everyone,
i've been doing some reading on traffic shaping with voip devices. I've seen it suggested that one create static-dhcp entries for your phones, then create an alias called 'voipdevices' and use this alias when running through the traffic shaper wizard.
i wanted to know how would i give higher priority to the traffic from siproxd (on the router) out to it's out-bound proxy. after fiddling with the traffic shaper rules for a while i'm still stumped.

if at all possible, it would be a nice to have a feature under the siproxd pkg that allowed you to put the traffic from siproxd directly into a default voip queue. i could pay someone to make this modification if neccessary.
thank you,