1. A PUCI system including: a call session control function (CSCF); and a plurality of PUCI application servers, wherein the plurality of PUCI application servers makes an evaluation as to whether a communication received from a user equipment is an unsolicited communication; the CSCF makes a decision on routing toward the plurality of PUCI application servers based on the evaluation; and the plurality of PUCI application servers executes the routing based on the decision.