Systems and methods for classifying and routing an inbound call using ENUM queries are described. When a calling party initiates an inbound call, an Interconnect Session Border Controller (I-SBC) may generates a query for a calling party number (CgPN) and a called party number (CdPN) to search CgPN information and personal number block (PNB) information in a first E.164 Number to URI Mapping (ENUM) database. If the I-SBC is able to check the CgPN using the first ENUM database, the I-SBC may set a parameter of the inbound call to a first status to avoid further checking. Otherwise, the I-SBC may set the parameter to a second status, and the inbound call, tagged with a service provider identification (SPID) number associated with the classification found in one or more of the ENUM databases, is processed based on the SPID.