Mexico City Area, MexicoIMS/VoLTE Core Network Engineer for AT&T in Mexico City. VoLTE sub-project coordination. Collaborating with third party vendors and stakeholders to design, test and deploy multiple ongoing projects (VoLTE Roaming S8HR, VoWiFi, IPSMS, AES “Apple Entitlement Server”, etc.). Technical Consulting involving all active IMS/VoLTE elements (ICSCF, P-CSCF, S-CSCF, TAS, MRF, SCC-AS, etc.) ePDG and PS e...