[Users] asterisk

Hi, I'm new to the list and didn't find this information in the archives so bare with me if this has already been discussed in the list. I'm trying to setup openser toghether with asterisk on the same machine. I don't get it to work using the basic information I found on the web with rewritehostport("localhost:5090") and t_relay(). openser is running on port 5060 and * on 5090. When using tcpdump on the machine openser is not even contacting asterisk on port 5090 instead it returns "100 trying..." to the phone. openser will just work as a proxy to * and add some extra security but most of the pbx routing logic and voicemail will be handled by *. Anyone having this up and running and willing to share the required configuration? thanks urban