Senior Telephony Engineer

We are looking for a Senior Telephony Engineer to design build and operate enterprise-grade voice infrastructure bridging traditional telephony with modern AI-powered real-time voice systems. You will work at the intersection of SIP/VoIP networking cloud communications platforms and AI voice agent development enabling seamless caller experiences through intelligent automation. This role requires both deep protocol-level expertise and hands-on software development capability with a strong emphasis on building production-ready SIP gateways and integrating real-time conversational AI services.

Key Responsibilities

SIP & Telephony Infrastructure

• Design configure and maintain SIP trunks dial plans and call routing across multi-platform environments.
• Build and operate SIP gateways including custom media handling audio transcoding (e.g. μ-law/G.711 to PCM16) and call state management.
• Configure and manage Session Border Controllers (SBCs) for enterprise-grade SIP peering security and interoperability.
• Implement SIP signaling stacks (e.g. pjsua2/pjproject or equivalent) for programmatic call handling and custom media port implementations.
• Ensure high availability redundancy and failover across voice infrastructure.
• Monitor and troubleshoot SIP signaling RTP streams and voice quality issues (jitter packet loss codec mismatches).

Cloud Voice & AI Integration

• Integrate telephony platforms with cloud-based real-time voice AI services (e.g. Azure Voice Live API AWS Connect or equivalent) via WebSocket-based media streaming.
• Build and maintain SIP-to-AI gateway architectures that bridge PSTN/SIP callers to speech-to-speech AI pipelines with low-latency audio delivery.
• Implement asynchronous high-concurrency audio stream bridges to handle parallel voice sessions at scale.
• Integrate with Azure AI Foundry Azure Communication Services (ACS) or equivalent platforms for PSTN SIP transfer IVR/DTMF routing and number provisioning.
• Deploy and tune AI-powered voice bots and virtual agents working with ASR TTS and end-of-turn detection configurations.
• Leverage cloud platform services (AWS or Azure) for infrastructure provisioning container deployment and voice workload scaling.

CTI & System Integrations

• Integrate voice platforms with enterprise systems (CRM WFM ticketing) via REST/SOAP APIs and webhook-driven event architectures.
• Implement Data Actions OAuth 2.0 authentication and secure API integrations across telephony and AI platforms.
• Collaborate with AI/ML teams on LLM-backed virtual agent design function calling and tool orchestration within voice flows.
• Configure inbound/outbound call flows ACD queues skills-based routing and IVR self-service trees.

Development & DevOps

• Write production-grade code in Python JavaScript Java or C# for SIP gateway logic audio processing and integration middleware.
• Work with SQL and database systems for call data storage reporting and analytics.
• Follow Git-based version control CI/CD pipelines and infrastructure-as-code (Terraform or equivalent) practices for deployments.
• Implement structured logging observability and alerting for real-time voice system health monitoring.

Governance & Documentation

• Produce detailed technical documentation: call flow designs SIP ladder diagrams integration runbooks and API references.
• Enforce enterprise security standards including TLS for SIP signaling SRTP for media and network segmentation.
• Collaborate with network engineers to optimize QoS bandwidth allocation and voice traffic prioritization.

Qualifications :

Required

• Bachelors degree in Telecommunications Computer Science or a related field.
• 5 years of enterprise telephony experience with SIP VoIP RTP and related protocols.
• Hands-on experience with SBC configuration and SIP peering (Audiocodes Oracle Ribbon or equivalent).
• Experience with PBX/media server platforms such as Asterisk FreeSWITCH or equivalent open-source stacks.
• Working knowledge of audio codecs (G.711 μ-law/a-law G.722 Opus) and real-time audio transcoding.
• Proficiency in at least one programming language: Python JavaScript Java or C#.
• Experience integrating telephony with cloud platforms AWS (Connect Chime SDK) or Microsoft Azure (ACS Voice Live AI Foundry).
• Familiarity with WebSocket-based real-time streaming protocols for media and API communication.
• Hands-on CTI integration experience REST/SOAP APIs OAuth 2.0 webhooks.
• Experience with Git and CI/CD workflows.
• Working knowledge of SQL and relational databases.

Preferred

• Direct experience building or operating SIP-to-AI gateway architectures (pjsua2 SIPp or similar SIP stacks in Python/C).
• Experience with Azure Voice Live API Azure AI Foundry Agent Service or OpenAI Realtime API for speech-to-speech voice agents.
• Familiarity with Azure Communication Services (ACS) for PSTN SIP transfer and real-time media.
• Knowledge of infrastructure-as-code tools (Terraform Bicep) for cloud telephony provisioning.
• Experience with container orchestration (Docker Kubernetes) for deploying scalable voice services.
• Prior hands-on work with Genesys Cloud Avaya Cisco CUCM or Twilio.
• Relevant certifications in telephony cloud (Azure/AWS) or AI platforms.

Career Growth

High performers in this role will have a clear path to:

• Telephony Solution Architect leading enterprise voice design SIP gateway architecture and AI voice platform strategy for large-scale client deployments.
• Unified Communications Lead owning end-to-end UC strategy across voice chat and AI-powered channels.
• AI Voice Platforms Specialist driving real-time conversational AI architecture LLM-integrated voice agent design and next-generation speech platform development.

Additional Information :

All your information will be kept confidential according to EEO guidelines.

Remote Work :

No

Employment Type :

Full-time