Chandresh Tank

Collaborated with product management teams to define and refine product requirements, contributing valuable insights based on technical expertise and customer use cases. Actively participated in product planning and roadmap discussions, providing input on feature feasibility, potential technical challenges, and estimated development timelines. Lead the Voice team in conducting end-to-end call testing, including SIP to WebRTC, SIP/PSTN, API, Android calls, and IOS calls, while also overseeing QA testing, automation, and deployment activities. Performed comprehensive call testing, including SIP, API, WebRTC to WebRTC/PSTN/SIP calls and addressing ICE candidate offer and answer issues across multiple OS (mac, windows, chromebook). Demonstrated expertise in WebRTC UDP and TCP candidate testing, encompassing UDP (host, prflx, srflx) and TCP (active, passive, etc.), while proficiently debugging ICE and DTLS-related issues. Lead and tested major upgrades of Freeswitch, Kamailio, and Opensips taking complete ownership and responsibility. Handled Pagerduty on-call duties, promptly resolving production customer issues, managing outages, and addressing customer tickets. Added New QA Process, Production Health Checks and Customer use cases. Performed comprehensive testing, debugging, and automation of RTP-related internal and customer issues. Mentored and guided SDE-1 and SDE-2 team members, actively addressing technical debts, architectural changes, and refactoring in product and technical roadmaps.

Experimentation with several types of sonus SBC Hardware (5100, 5110, 5200, 5210, 5400 and 7000). Write a test case using the customer's requirements and several types of call flow combinations. Create a configuration with interoperability with different Sonus products utilized by the customer, such as SBC, PSX, and GSX. To Manual and Automation Test Case Execution, as well as Customer Used Future Test (RBT, LI, SIP-Rec, DTMF, Forking, Transfer) Pass-through, Transcoding, and SRTP Benchmark Activity for Each Release. To develop and execute manual test cases and automate those cases for future regression execution. To analyze call flow with various tools and execute with customer-related environment configuration. Performance Evaluation Using Various Call Types Combine load tests with overnight and weekend loads, then analyse the results for things like memory, CPU usage, call rate, and failure rate.

Airtel - VoLTE SCFT, Cluster on field testing and analysis. Huawei GSC Office - South africa VoLTE Project Site & Cluster planning and KPI Analysis.

Live End to end debugging Testing on filed for LTE & VoLTE Testing. Analyzing and Debugging of L1, L2& L3 protocols, RRC, RLC, PDCP, EMM, ECM, NAS, S1-AP Protocol. On Filed Tested and Implementation of Features like LTE RAN Interoperability, CSFB, SRVCC, Admission control, redirect, reselection, Handover, Data forwarding for HO etc. KPI Analysis of LTE single site & Cluster.