Firstly, let me just say that I have read through the Advanced Routing & Traffic Control HOWTO, but can't figure out the answer to my question:

I have an Asterisk VoIP server running on a server which is also the internet gateway for our network. Unfortunately, there isn't much outgoing bandwidth available - 512kbps shared between the entire network.

What I want to do is give the Asterisk IAX port (4569/UDP) priority over all other traffic - so that it gets the bandwidth it needs for outgoing voice traffic, but doesn't permanently reserve the bandwidth unnecessarily.

From reading the HOWTO, I'm not sure if it is possible to do that, but if so then some (pretty specific smile.gif) info would be great.