Jun 2017 – May 2023 · 5 yrs 11 mos · Bengaluru, Karnataka, India

• The Radisys MRF (Media Resource Function) is a carrier‐class platform designed to process voice, video, and data efficiently and cost-effectively. Combine these into a rich, multi‐service communications experience.
• Responsibilities include outlining test strategy, documenting test case titles, test procedures, call flows and test summary report of various MRF products such as Virtual MRF, Distributed MRF and Containerized DMRF.
• Feature testing of WebRTC ICE protocols - STUN and TURN.
• Design validation of MRF use cases such as audio, video, and multimedia announcements, recording, transcoding, and conferences solutions.
• Automation of MSML and MSCML conference test cases based on RFC 5707 and RFC 5022, respectively using SIPP and inhouse tools.
• Deployment of MRF in cloud native environment with technologies such as OpenStack, VMWare, KVM, Nokia CBAM, Kubernetes and Docker.
• Proficiency in customer training with various Radisys MRF products.
• Testing of VoLTE and ViLTE call flows with MRF media analytics related use cases such as face authentication, face identification, and object detection.

Nov 2011 – May 2017 · 5 yrs 6 mos

• Technically driving the team to ramp-up and produce the deliveries efficiently for various IMS enabled chipsets in Qualcomm.
• Collaborating with different stakeholders to make sure on time delivery and seamless integration of IMS application.
• Optimization of test life cycle, Root cause analysis of customer defects and improving test coverage for various IMS features.
• Test strategy and test plan preparation for handover use cases between VoWiFi to VoLTE and vice versa.
• Testing and Commercialization of VoLTE and VoWiFi on various Qualcomm chipsets.
• Extensive use of Qualcomm tools such as QXDM, QPST, QCAT and Apex for debugging and log analysis

Jan 2010 – Nov 2011 · 1 yr 10 mos

• Worked on Commercialization of SMS over IMS features on various Qualcomm chipsets
• Deriving test cases for XCAP protocol over Ut interface based on 3GPP standards TS 24.623 and GSMA IR.92 specification.
• Outlining Test strategy and execution of voice call handover procedures using CSFB (Circuit Switched Fall Back) and SRVCC (Single Radio Voice Call Continuity) method.
• Testing of Single SIM (Subscriber Identity Module) and Dual SIM features on modems.
• Collaborating with cross teams in resolving the issues reported by customers.
• IMS Conformance testing of 3GPP TS 34.229-1 specification using Anritsu and R&S simulators

Dec 2007 – Mar 2010 · 2 yrs 3 mos

• Test plan writing and execution of Session Management and Station Management functionality of Smart works IPX which is an essential part of call recording solutions
• Designed and Developed Perl based Packet generator tool which generates Avaya point to point calls with different IP and call id for each call.
• Environments include automation test tool development on windows and Linux platform using C, Scripting in Perl, Use of Sipp for Bulk call testing
• System testing and Performance testing of SIP based Session Border Controller which operates in dual mode (Stateful SIP Proxy Mode and B2BUA mode)
• Feature testing of Fragmented media packets, Denial of Service at various levels, Traffic selectors and Dead Peer Detection.
• Responsible for detailed analysis of Customer bugs, stability, and stress testing of SGW (Audio Codes Security Gateway).
• Performed requirement analysis, test plan, developing test scripts and documenting test cases for GTP-U Proxy feature.
• Automated SIP Call feature test scripts for CW, CFNA, Call transfer and Music on Hold. using Quadtech and Hammer tool

Jun 2006 – Dec 2007 · 1 yr 6 mos

Jan 2005 – Jan 2006 · 1 yr · Fort Worth, Texas, United States

• Inter Vendor Validation (IVVV) lab bring up and Certification of various IMS entities for Inter-Operability Testing (IOT) w.r.t. 3GPP IMS standards.
• Worked on system integration of different components of the network from different vendors (E.g., Sylantro Application Server, Acme Packet SBC, Apertio HSS, Iperia Unified Messaging Server and Cisco ISR as MGCF gateway), Sonus (PSX).
• Worked on Simulation or script development for different call feature models (CW, CFNA, CFB etc.) based on requirements using Spirent Protocol Tester (SPT).
• Integrated Cisco ISR 2811 as SIP-PSTN Media gateway into IMS network and evaluated for the CAS, FXS / FXO and ISDN signaling.
• Worked on Load Generation using Empirix Hammer tool and performance testing of IME core network using scripts developed for distinctive features.
• Experience in integrating/working with various components of a distributed next generation IP based architecture including soft switches, Gateways, SIP Proxies, Route Engines, IP Media Servers, IP Phones/IADs.
• Involved in drafting White paper, Requirement Analysis, Test Case Title & Procedure, Test Strategy document and Exit Summary Report.
• Conducted security audit for IMS network and Bug fixes for all elements of the network to avoid hacking of the system by unauthorized users.

Jan 2004 – Jun 2006 · 2 yrs 5 mos · Bengaluru, Karnataka, India

• SIP Server is the IP interface for CSX 2100 system to support SIP-to-SIP, SIP-to-PSTN and PSTN-to-SIP calls.
• It supports call features like Call hold, Call forwarding, Call Transfer, and Voice Mail through MWI, and more ...
• Involved in Design, Development & Testing of SIP Server which acts as B2BUA, Registrar, Redirect and Location Server.
• Participated in the entire software life cycle of SIP Server Project - Designing, Coding, Unit testing, Defect fixing during Integration testing & Product acceptance testing, Interoperable testing, and Field Support
• SIP Stack enhancement for RFC 3261, RFC 3265, RFC 3966 and stabilizing the same using Torture Test Tools.