Below are the Job Description details 

Direct Customer facing Role.  Role involves Travelling at Customer locations.  Experience on various interfaces of DIAMETER protocol. Good Knowledge on Diameter base protocol and End to End 4G/VoLTE call flows.  Understanding and Work experience on PCRF, DRA, SBC products. Expertise in Configuration of New Nodes Installation of Linux based OS Experience in deployment of DRA and PCRF and integration of peering nodes with same.  Configuration and Integration of DRA, PCRF and SBC Create High level design and LLD low level Design Documents Create, Prepare and Implement Acceptance Test Plans Good Experience on Policy and Routing design and solutioning Experience on SIP/VOIP Good Knowledge on SIP Protocol (RFC 3261) and End to End call Flow (Registration, Call Hold, Call Forward,  Call Conference, Call Forking, Call Transfer etc.).  Understanding on IMS Platform. P-CSCF/ I-CSCF/ S-CSCF, TAS, MGCF Protocol interworking (H323 & SIP) ,  Media interworking - DTMF relays & codecs )  Good Understanding on Codec transcoding