Senior Specialist

Infinite Computer Solutions · Noida

Source and collection record

Last observed by our collector: 8 October 2026 at 11:34 pm IST. This is not a manual review or a confirmation from the employer.

Employer requisition: 48545BR

Job type and experience labels are automated discovery categories. The employer determines eligibility. Original experience wording was not retained separately; check the current employer page.

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Collected role description

T3 Support – IMS /CS CORE EXPERT  Role Summary  The L3 IMS/CS Core Expert is responsible for advanced troubleshooting, performance optimization, and end-to-end support of IMS and Circuit Switched (CS) Core network elements. The role involves handling complex issues escalated from L1/L2 teams, ensuring service continuity, and providing expertise for incident, problem, and change management. With these activities, you will have a great impact on our business:  Key Responsibilities  <ol role="list" start="1"><li aria-setsize="-1" data-aria-level="1" data-aria-posinset="1" data-f="" data-leveltext="%1." data-list-defn-props="{" 335552541":0,"335559685":720,"335559991":360,"469769242":[65533,0],"469777803":"left","469777804":"%1.","469777815":"hybridmultilevel"}"="" data-listid="7" role="listitem">L3 Technical Support </li></ol> Provide advanced troubleshooting for IMS and CS Core issues (VoLTE, VoWiFi, MO/MT call failures, SMS failures, Handover failures). Analyze call traces (SIP, Diameter, ISUP, MAP, CAP) and perform deep-dive RCA. Support high-severity (P1/P2) incidents and ensure timely resolution. Handle escalations from Tier-1/2 NOC for CS/IMS nodes (MSC/MSC-S, MGW, HLR/HSS, STP, MTAS, CSCF, SBG, ENUM, DRA, IBCF/TrGW).   Handle SIP registration issues, VoLTE attach failures, IMS bearer issues, and interworking problems. Optimize VoLTE/IMS call flows, QoS, and media negotiation.  <ol role="list" start="2"><li aria-setsize="-1" data-aria-level="1" data-aria-posinset="2" data-f="" data-leveltext="%1." data-list-defn-props="{" 335552541":0,"335559685":720,"335559991":360,"469769242":[65533,0],"469777803":"left","469777804":"%1.","469777815":"hybridmultilevel"}"="" data-listid="7" role="listitem">CS Core Expert </li></ol> Support legacy CS Core elements: MSC, MSC-S, MGW, HLR, STP, VLR Resolve circuit-switched issues (2G/3G call setup, supplementary services, roaming failures).