Hi, I have registered with IPTEL online proxy with registered users. But when I try to make a call using the alias phone number of the user(INVITE will go with phone number(aliasnumber(a)iptel.org) but proxy is not translating or transforming the To field to the username(That is used for registration) in INVITE message that is sent to gateway.Is there standard message format [Sudheendra] in the REGISTER message to get the translation or transformation of the URI.Thanks for your response in advance. Regards Sudhi