We are having something of an issue with lookup_user() and lookup_contacts(). Our UA's are added to the proxy using "ser_ctl user add 1234567890(a)ourdomain.com -p password" which works great And the UA's register just fine. When a call comes in from a carrier, the invite is for 1234567890(a)12.34.56.78 where 12.34.56.78 is the IP address of our proxy. When we do a lookup to see if the call is destined for a local user via lookup_user("$tu.uid","@ruri") it fails because the registration is done using the URL and not the IP address. If I add the same user for the IP address domain, "ser_ctl user add 1234567890(a)12.34.56.78 -p password", the lookup_user() works, but the lookup_contacts(0 never does. I have tried adding aliases in the ser.cfg file: alias=12.34.56.78 alias=proxy.ourdomain.com but it does not work. I'm new to SER and the documentation I have been able to locate does not really address this issue, if, in fact, it really is an issue. If anyone could point me to something that will help me work through this problem, I'd greatly appreciate it. Thanks, Bill Bill McNamara billmc(a)connectmevoice.com ConnectMeVoice LLC 800-743-1208 x104