I downloaded the SIP Express Router on Nov. 6. I run a VoIP course (among others) and want a SIP application to show to my students and I found yours interesting. However, I ran into an obstacle, possibly a problem/bug. The details: System: Red Hat 7.3 Personal on a 200 MHz Intel 'Ser' distr.: 0.8.11 RPM-package for RH 7.3 Clients using Windows Messenger Ser.cfg: As distributed but with option <alias="matell5.no"> added (in front of the 'check_via' option. Works fine. &lt;km(a)matell5.no&gt; and others with the same domain can sign in, contact with other clients established etc. Then I add another domain to 'alias' as in <alias="matell5.no" "f19-21.no">. 'ser' starts OK ('ser start' reports [OK] and /var/log/messages says 'ser' is listening on all IP adresses and both aliases are listed and "ser startup successful"). However, attempted sign-in from clients (with the same domain name as earlier) result in ICMP Destination Unreachable/Port Unreachable (port = 5060) and an attempt to stop 'ser' ('ser stop') reports [Failed] and /var/log/messages says "ser shutdown unsuccessful". I have also tried using two lines for the 'alias' parameters (<alias "matell5.no" \n alias "f19-21.no"> with the same results. Then I remove one 'alias' to return to the successful 'ser.cfg' with only one 'alias', and I get the same IMCP message (Port Unreachable). Then I reboot the computer (no further changes to 'ser.cfg') and the clients can sign in without a hitch. The 'ser' Admin's Guide chapter 6.1 'Core Options' clearly indicates that the 'alias' option can take several domain names. (It actually says hostnames. I tried 'mytikas.matell5.no' which is name of the machine 'ser' is running on but this caused the same erroneous result as above. Changed it back to just the domain name and I could sign in normally again. If I am doing something wrong here (or not doing something I should be doing) I would appreciate if you would tell me. I am relatively new to Linux and Linux applications and sometimes find the documentation difficult to understand. If you want me to supply more information like logs etc. let me know (if this really is a bug you probably will). I'll be happy to do more testing/experimenting. I am not running mysql. I'll try that next. Thanks. (Hope I am sending this to the right place.) Kjell Mathiesen Matell Software AS Fururabben 19 1361 Østerås, Norway Tel. (+47) 6714 6509 Mob: (+47) 9073 2212 km(a)matell.no www.matell.no