Cellular device Testing (Callbox / Wireless Lab)

Network Test Engineer (Callbox / Wireless Lab) San Jose, CA Callbox Operation & Test Bed Bring-Up anritsu, keysight or amarisfot callboxes. and with LTE /5G related testing experience. Configure, calibrate, and operate industry-standard cellular callboxes (e.g., Anritsu MT8821C / MT8000A, Amarisoft Callbox Classic / Ultimate, Keysight) for RF simulationand device verification. Set up 4G LTE, 5G NR Standalone (SA), and Non-Standalone (NSA) simulated network cells with varying carrier bandwidths, MIMO configurations, and frequency bands. Maintain lab RF cabling, attenuator matrices, splitters, and RF shielding enclosures to ensure interference-free test execution. Test Execution & Network Validation Execute comprehensive test suites for cellular device bring-up, carrier feature acceptance, and multi-SIM behavior. Validate core features including: Dual SIM Dual Standby (DSDS) and seamless data switching. IMS Services: VoLTE, VoNR, Wi-Fi Calling (VoWiFi), and SMS/MMS over IP.Network attach/detach, inter-RAT handovers, cell reselection, and mobility transitions.5G Standalone (SA) registration, PDU session establishment, and network slicing behaviors.