1. A method for processing a session request in an Internet Protocol (IP) network, comprising: receiving the session request from a calling party to a called party, wherein said session request includes a service tag; determining a value of said service tag in said session request; querying an tElephone NUmbering Mapping (ENUM) server for one or more Naming Authority Pointer (NAPTR) resource records associated with said called party; selecting one of said one or more NAPTR resource records in accordance with said service tag, if said one or more NAPTR resource records associated with said called party are returned; and processing said session request using said one of said one or more NAPTR resource records that is selected.