Quality Assurance Tester – UCaaS / PBX / VoIP Systems

Angel PBX, group; Kolkata District; Hybrid; INR 600,000 - 1,000,000; Full time

Benefits offered by this job

Competitive salary

Bonus

Benefits package

Remote work options

Job summary

A leading VoIP solutions provider is seeking a Quality Assurance Tester to ensure the quality of UCaaS features. The ideal candidate will have 3-5 years in QA for VoIP systems, with strong knowledge of SIP and experience in test automation. This role offers competitive salary and hybrid or remote work options in Kolkata.

Qualifications

• 3+ years in QA/testing of UCaaS, PBX, or VoIP systems.
• Strong knowledge of SIP, SDP, RTP/SRTP.
• Hands-on experience with SBCs and SIP endpoints.
• Experience with test automation in one or more languages.

Responsibilities

• Define test strategies for real-time communications features.
• Develop and maintain comprehensive test plans.
• Conduct load and stress tests for UCaaS platforms.
• Log clear, reproducible defects and drive resolutions.

Skills

Attention to detail

Problem-solving

Communication

Analytical skills

Tools

Wireshark

SIPp

JMeter

Docker

Job description

Quality Assurance Tester – UCaaS / PBX / VoIP Systems

We are Currently Looking for Quality Assurance Tester

• Level of Experience: 3-5+ Years
• Job Type: Full Time
• Location: Kolkata

About the Role

We are seeking a detail-oriented, methodical, and customer-focused Quality Assurance (QA) Tester with deep expertise in UCaaS, PBX, and VoIP systems. You will own the end-to-end quality of real-time communications features across call control, SIP trunking, media services, voicemail/IVR, conferencing, contact center integrations, SBCs, and interoperability with endpoints and third‑party platforms. Your work ensures our users experience crystal‑clear audio, reliable connectivity, and resilient calling features at scale.

Key Responsibilities

• Define test strategies and traceability for real-time communications features: call flows, signaling, media, QoS, survivability, and failover.
• Develop and maintain comprehensive test plans, test cases, and test data for SIP/SDP, RTP/SRTP, DTMF, fax (T.38), conferencing, and UCaaS collaboration features.
• Establish risk‑based testing and regression coverage for frequent cloud releases and configuration changes.
• Functional & Integration Testing
  • Validate PBX/UCaaS features: user provisioning, dial plans, E911, call routing, call park/pickup, hunt groups, auto‑attendant/IVR, voicemail, recording, presence, and analytics.
  • Test SIP interoperability with SBCs, gateways, carriers, softphones, desk phones, headsets, and mobile apps across multiple vendors.
  • Verify integrations with contact center, CRM, SSO/IdP, API/webhooks, and Microsoft Teams/Zoom/Google interop.
• Network & Media Quality
  • Execute QoS/CoS testing, jitter/latency/loss tolerance, MOS scoring, packet capture analysis, codec negotiation (G.711, G.722, Opus, G.729), and media encryption (SRTP/TLS).
  • Validate NAT traversal, ICE/STUN/TURN flows, firewall/SBC rules, and bandwidth adaptation in varied network conditions (Wi‑Fi, LTE/5G, VPN).
• Automation & Tooling
  • Build and maintain automated test suites (API, signaling, provisioning, and end‑to‑end call flows).
  • Integrate tests into CI/CD pipelines with environment provisioning, synthetic call generation, and monitoring.
  • Leverage packet capture and signaling tools to diagnose issues quickly and provide actionable defect reports.
• Performance, Reliability, and Security
  • Conduct load/stress, soak, and failover tests for multi‑tenant UCaaS platforms and carrier interconnects.
  • Validate redundancy, geo‑failover, disaster recovery, and session persistence.
  • Verify compliance and security controls: TLS/SRTP, encryption at rest, RBAC, audit logging, lawful intercept readiness, and regulatory features (E911/NG911, STIR/SHAKEN).
• Log clear, reproducible defects with traces, logs, and call IDs; triage and drive resolution with engineering and operations.
• Partner with Product, Dev, SRE/NetOps, and Support to align on acceptance criteria, SLAs/OLAs, and release readiness.
• Contribute to test data management, documentation, and user‑facing release notes.

Required Qualifications

• Experience: 3–5+ years in QA/testing of UCaaS, PBX, or VoIP systems in cloud or hybrid environments.
• Protocols: Strong knowledge of SIP, SDP, RTP/SRTP, TLS, DTMF (in‑band, RFC 2833), T.38.
• Platforms/Equipment: Hands‑on with SBCs (e.g., SBC Edge/Oracle/AudioCodes), SIP trunks, softswitches, IP PBX, SIP endpoints, SIP carriers.
• Networking: Solid grasp of OSI/L3–L7, VLANs, QoS/CoS, NAT, firewalls, DNS, DHCP, SBC routing, ICE/STUN/TURN.
• Tools: Proficient with Wireshark, sngrep, SIPp/Seagull, tcpdump, JMeter/k6, Postman/Insomnia, Grafana/Prometheus/CloudWatch, and log analysis.
• Automation: Experience with test automation in one or more languages (Python/TypeScript/Java), API testing, CI/CD (Jenkins/GitHub Actions/GitLab CI), and containerized test environments (Docker/K8s basics).
• Methodologies: Strong understanding of SDLC, Agile/Scrum, defect lifecycle, risk‑based testing, and release management.
• Communication: Excellent written and verbal communication, with ability to translate traces and metrics into clear findings.

Preferred Qualifications

• UCaaS/CPaaS: Experience with major UCaaS platforms or CPaaS APIs; WebRTC and media server testing (SFU/MCU).
• Contact Center & Integrations: Familiarity with contact center platforms (e.g., Genesys, Five9, NICE), CRM integrations, and SSO (SAML/OIDC).
• Interop: Exposure to Microsoft Teams Direct Routing/Operator Connect or Zoom Phone integrations.
• Regulatory: Knowledge of regulatory frameworks: E911/NG911, CALEA, STIR/SHAKEN, HIPAA/PCI considerations.
• Performance/Resilience: Performance and resilience testing at scale for multi‑region, multi‑tenant architectures.

Key Success Metrics

• Quality Metrics:
  • Defect leakage rate and mean time to detect/resolve (MTTD/MTTR).
  • Automated test coverage and pipeline reliability.
  • Call success rate (ASR), post‑dial delay, media quality (MOS), and feature pass rates.
  • Release quality and rollback avoidance.
  • Interop certification outcomes with carriers/endpoints.

What You’ll Work With

• Cloud‑native UCaaS microservices, SBCs, media relays, and provisioning systems.
• Carrier SIP trunks and lab environments with synthetic traffic generation.
• Observability stack with real‑time metrics, traces, and call detail records (CDRs).

Compensation & Location

• Competitive salary, bonus, and benefits package.
• Hybrid or remote options depending on region/time zone alignment.

How to Apply

Please send your resume and a brief note highlighting:

• A complex VoIP/PBX issue you diagnosed using SIP traces, and your resolution.
• An example of test automation you built for SIP call flows or UCaaS features.
• Any interop or carrier certification projects you led.