JD: Cognizant is looking for a test lead engineer that has 6-8 years experience SIP, IMS Core, VoLTE/CVoIP call flow process for testing and validation. Following skills/experience required: Strong knowledge in 5G/LTE/UMTS VoLTE/IMS Network Performance and Capacity Test and IMS Nodes Performance Benchmarking Activities. Extensive Hands on experience with VoLTE/IMS Call Processing and VoLTE/IMS Supplementary Services. Need tohavehands on experience IMS Related Protocols Signaling Analyzing (V