[Users] openser domain

dear sir or madame; i enjoy to be one of the members of your great site! i think you for all your pretty informations that you give us. If you want to send me how to create an openser domain! because when i log a user softphone to the openser, i see that it not log to the server! i think that i have problem with domain name. if i must create a domain name to make it work please send me how to do it, and if there is another way send me too, i need your help! for more information i have installed mysql, openser in a debian linux platform, and all is ok. i choose x-lite for a softphone example to log to the openser server. your faithfully simo