Earners of this certification have advanced theoretical and practical/operational in-depth knowledge of various Ericsson nodes in a telecommunications network environment, such as Serving GPRS Support Node/Mobility Management Entity (SGSN-MME), Evolved Packet Gateway (EPG), and Policy and Charging Control (SAPC) nodes. All badges are subject to change or revocation. If no expiration date appears below, this badge does not expire.