Hi, You need a database for your code/domain pairs. File doc/pdt.sql tells you how the database should look like. Please note that the prefix associated with a domain is called code, to avoid confusions with the prefix parameter of the module, which is a prefix that tells what RURIs will be rewritten. RURI: [<prefix>]<code><userid><:password>@<mydomain.com> ... Then you have to set the module parameters. The terminator parameter specifies the digit that ends the code (to know when to stop searches ) and can be left unset, implicit is 0. Note that in the database the code are stored without the ending digit, but in the RURI must appear with ending digit. If you want that the RURI rewrite occurs when the RURI starts with "0" you have to set the prefix parameter to "0". Example: modparam("pdt", "terminator", 0) modparam("pdt", "prefix", "0") One entry in the database: code=1, domain=otherdomain URI:010xxxxxx@mydomain New URI after applying prefix2domain is: xxxxxx@otherdomain Greetings, Ramona Shady wrote: