Expert knowledge of 5G SA, NSA and LTE call flows from a E2E perspective (Device a € RAN a € Core Network).
Expert knowledge of the call flows of services and features such as Voice, Messaging, UCE, UT, USSI, HTTP, VoLTE, VoWiFi, IR92, IR94, AS262 HO, WPS, RTT, N11, International Wi Fi and S8HR.
Expert knowledge of VOIP protocols such as SIP, Megaco/H.248, MGCP, DNS, LNP, TCAP, SDP, RTP, DIAMETER), IMS (Audio/Video call signaling, Instant Message, RCS, Presence, Subscription), VoNR, VoLTE / LTE EPC
Expert knowledge of 5G and LTE EPC core protocols such as GTPV2C,GTPV1C, GTPV1U, S1AP
Experience with and understanding of how NATing and Proxy functions work in a packet core and the implications for connectivity (routing and firewalls) to services platforms