It's not well documented in the admin manual. In fact, a lot of new features are not documented anywhere except bits and pieces discussed in the forum. So, try to do a search on it. There are a lot of hidden treasure in the NEWS file. Also, under each module directory, there should be one C file that has a line like: Static cmd_export_t cmds[]={ ... }; These are the functions available for use in script unless it has the NO_SCRIPT entry. Static param_export_t params[]={ ... }; These are the parameters for each modules. The best way to understand these functions and parameters is to read the code or ask in the forum. Generally, I found people are helpful here. Regarding your question, if your original script works, try this. if ( (uri=~"^sip:123[0-9]*@.*") ) { record_route(); rewritehostport("fx0.voipgateway.com:5060"); t_relay_to_udp("fx0.voipgateway.com", "5060"); }; You can even use just t_relay() instead of t_relay_to_udp(). It should work. Zeus