[Serusers] How to configure multi-domain?

I've added the following lines to my ser.cfg file: ################### modparam("usrloc", "use_domain", 1) #If the domain part of the user should be also saved and used for identifing the user (along with the username part). Useful in multi domain scenarios. Non 0 value means true. modparam("registrar", "use_domain", 1) # If set to 1 then the registrar will use username@domain as address of record. If the variable is set to 0 then only username will be used as the address of record. Default value is 0. ################### I've added 2 diferent domains to the domain table, and got different phones registered with those different domains. Although, after editing that way ser.cfg file, my phones still register in Ser, but none of them can call any other, even if I call someone only by username or by username@domain. Am I in the right path to configure a multi-domain Ser server? What else should I do to make things work fine? Regards, Ricardo.