Senior Technology Architect / Technical Manager — 21+ years building carrier-grade VoIP, IMS, and Telecom solutions
M.Tech, IIT Kharagpur — Telecommunications Systems Engineering
Currently architecting enterprise provisioning and voice platforms at Infosys for Verizon and Comcast. Previously led VoIP product development at TATA ELXSI, built ISDN-PBX systems and VoIP gateways at ITI Ltd R&D.
I build the systems that make phone calls work.
Voice Engineering SIP | H.323 | MGCP | MEGACO | RTP/RTCP | SRTP
WebRTC | SDP | ICE/STUN/TURN | DTLS-SRTP
IMS / 3GPP P-CSCF | I-CSCF | S-CSCF | HSS | AS
Diameter Cx/Dx/Sh | iFC | AKA Authentication
5G / NFV / SDN AMF | SMF | UPF | NSSF | NRF | PCF
ETSI MANO | Network Slicing | VNF Orchestration
OSS/BSS Service Provisioning | Order Management | LNP
Billing/Rating | Inventory | Number Porting
Infrastructure SBC (ACME, BroadSoft) | CMTS (Cisco, Arris)
Cable (DOCSIS 3.1, PacketCable 2.0)
Languages & Frameworks Java 17 | Spring Boot | Spring Cloud | Python
C/C++ | FastAPI | REST | Microservices
Cloud & DevOps AWS | Docker | Kubernetes | Helm
Jenkins | CI/CD | GitLab | Terraform
Active contributor to the VoIP and telecom open source ecosystem. Building tools and contributing to projects used in production networks worldwide.
My Projects
| Repository | Tech | What It Does |
|---|---|---|
sip-flow-analyzer | Python | Full SIP/RTP protocol analysis — parser, call flow engine, PCAP reader, load tester, QoS monitor with ITU-T G.107 E-model MOS scoring |
ims-cloud-core | Java / Spring Boot | Cloud-native 3GPP IMS core — P-CSCF, S-CSCF, HSS, Telephony AS as microservices with Diameter Cx simulation |
ai-voip-quality | Python / ML | ML pipeline for VoIP quality — MOS prediction, anomaly detection, Erlang B/C capacity planning, codec recommendation |
telecom-provision-engine | Java / Spring Cloud | OSS/BSS provisioning platform — order management, workflow engine, number porting, billing, 8 microservices |
5g-network-slice-manager | Python / FastAPI | 5G network slice lifecycle — ETSI MANO orchestration, eMBB/URLLC/mMTC templates, SLA monitoring |
webrtc-sip-bridge | Python / JS | WebRTC↔SIP gateway — SDP translation (ICE, DTLS-SRTP, BUNDLE), SIP transaction layer, browser softphone |
sbc-guardian | Python | Multi-vendor SBC fleet management — config versioning, real-time analytics, capacity planning |
sip-sentinel | Python | SIP security auditor — deep packet inspection, RFC 3261 compliance, vulnerability detection |
Contributing To
| Project | Stars | Role |
|---|---|---|
| Kamailio | 2.8k ★ | SIP server — testing, SIP module contributions |
| Asterisk | 3.2k ★ | PBX platform — VoIP integration testing |
| pjproject | 2.6k ★ | SIP/media library — SDP and codec work |
| open5gs | 2.5k ★ | 5G/LTE core — NF testing and deployment |
| free5GC | 2.3k ★ | 5G core network — testing and docs |
| HOMER | 1.9k ★ | SIP capture/monitoring platform |
| baresip | 2.0k ★ | Modular SIP user-agent |
| OpenSIPS | 1.5k ★ | SIP server and proxy |
| OpenAirInterface | OAI | 5G RAN implementation |
| Routr | 1.7k ★ | Programmable SIP server |
Infosys Ltd — Senior Technology Architect (2016 – Present)
- Architected VDDS provisioning platform for Verizon — Java/Spring Boot microservices on AWS serving global IP/Telecom service activation
- Led Comcast Business Voice engineering — SIP Trunking, Business Voice Edge, Commercial IMS, Cross Rate Center Porting
- Built and mentored teams of 10-15 engineers across design, development, and QA
TekWissen / TATA ELXSI — Senior Architect / Senior Specialist (2004 – 2016)
- Certified BroadSoft R16/R17/R18 server complex in Comcast core voice network
- Integrated ACME-9200/4500 SBCs, certified 20+ CPE devices with CMTS infrastructure
- Built TELTAF voice automation framework for Comcast BCV platforms
- Designed LifeSize H.323-H.320 video conferencing gateway with AES-128 encryption
ITI Ltd R&D — Executive Engineer / Research Scientist (1997 – 2004)
- Designed VoIP Voice Gateway (PSTN↔H.323), ISDN-PBX with BRI/PRI/SS7
- Built embedded telephone exchange for defense communications
- Hardware + software design on 80C31, 80C186, PPC platforms
| M.Tech | Electrical & Electronics Communications Engineering — IIT Kharagpur (1997) |
| B.Tech | Electronics & Communications Engineering — JNTU Kakinada (1995) |
| Certifications | BroadSoft NS/OM · Adtran AOS · Avaya |
| Award | Extra Mile Award — TATA ELXSI |
RFC 3261RFC 3550RFC 4566RFC 3311RFC 3515RFC 4733ITU-T G.107ITU-T G.711ITU-T G.7293GPP TS 23.2283GPP TS 29.2283GPP TS 23.5013GPP TS 28.530ETSI GS NFV-MAN 001DOCSIS 3.1PacketCable 2.0SS7 MTP L1/L2/L3ISDN PRI/BRI
kambidi@gmail.com · Chennai, India · github.com/kambidi1973