The present disclosure includes a system and method for discovering network elements. In some implementations, a method includes identifying information indicating a location of a femtocell device. A communication node associated with the femtocell device is identified. A Session Initiation Protocol (SIP) message including the location information is transmitted to the identified communication node. A response is received requesting that the femtocell device register with a different communication node associated with a cellular core network at least proximate the location.