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# Java Developer (SIP/VoIP

- **Company:** Adecco
- **Location:** Ipswich, UK
- **Contract:** Temporary contract
- **Skills:** Java (Programming Language), Automatic Call Distributor, Artificial Intelligence, Amazon Web Services, Microsoft Azure, VoIP, Cloud Computing, Java APIs for Integrated Networks, Java Servlet, Oracle (Applications), Systems Integration, Speech Recognition, WebRTC, Google Cloud, Rhino, Speech Synthesis, Docker
- **Published:** August 24, 2026
- **Apply:** https://www.adecco.com/en-gb/job-search/java-developer-ipswich-suffolk/broadbean_905621787591172

## About the Role

* Strong commercial Java development experience
 * Experience with SIP, VoIP, RTP/RTCP and SDP
 * Knowledge of JAIN SLEE and/or SIP Servlet frameworks
 * Experience with FreeSWITCH or Asterisk
 * Cloud experience across AWS, Azure or GCP
 * Strong troubleshooting skills within telecoms or voice environments

Nice to Have

 * Docker and Kubernetes
 * WebRTC
 * Telecoms security protocols including TLS and SRTP
 * Metaswitch Rhino SLEE or Oracle OCCAS experience

## Description

* Developing and enhancing SIP-based voice applications using Java
 * Working with JAIN SLEE and SIP Servlet frameworks
 * Supporting and integrating voice platforms including FreeSWITCH and Asterisk
 * Deploying and supporting solutions across AWS, Azure and GCP
 * Integrating Speech-to-Text, Text-to-Speech and AI-driven voice services
 * Troubleshooting voice quality, call routing and network performance issues


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