I already figured out how it can be done... The problem can be solved adding every domains that Ser proxy takes care to same alias in aliases table, for example like this: username | domain | contact --------------------------------------------------------------- 4119 | domain_A | user@domain_A 4119 | domain_B | user@domain_A This way, phones registered as different domains in the same Ser server can dial the alias 4119 without having to dial 4119@domain_A if the caller is registered in domain_B. It may sound like a bit lousy trick, but it works! In fact I agree that the best way to do this would be turning off the "use_domain" for aliases, but I don't know how can that be done because I guess that if we use modparam("usrloc", "use_domain", 1), use_domain will be available for everything. If someone knows how to disable use_domain for aliases, please tell me!! Regards, Ricardo. Bogdan-Andrei Iancu wrote: