Deploy a production-ready OpenSIPS server on Microsoft Azure in minutes. Built for Internet Telephony Service Providers (ITSPs), carriers and VoIP platform teams that need Class 4 SIP routing, least-cost routing, load balancing and SIP registrar functionality without spending days compiling modules, configuring databases or assembling management components.

Why OpenSIPS, and Why This Image

OpenSIPS powers SIP routing infrastructure for carriers and service providers worldwide, capable of handling tens of thousands of call setups per second. Its dynamic routing (drouting), load balancing, dialog-aware NAT traversal and SIP registrar capabilities make it one of the leading open-source SIP routing platforms for large-scale VoIP deployments.

This image delivers a production-ready foundation with OpenSIPS securely installed, configured and documented, allowing teams to focus on routing policies and service delivery rather than platform assembly.

What You Get Out of the Box

Latest stable OpenSIPS release installed from the official project repositories.
Security-focused defaults including Fail2ban SIP scanner protection, authentication enabled, rate limiting and prevention of open relay behaviour.
TLS support on port 5061 with documented Let's Encrypt certificate deployment.
WebSocket support staged for WebRTC deployments.

Common Use Cases

ITSP Routing Core – Prefix routing, least-cost routing, carrier failover and dynamic routing using the drouting module.
SIP Load Balancer – Distribute registrations and call traffic across media server clusters with health monitoring.
Class 4 Interconnect – Route SIP traffic between carriers with gateway capacity management and routing policies.

Choosing Between OpenSIPS and Kamailio

OpenSIPS and Kamailio both originate from the OpenSER project and are mature, carrier-grade SIP routing platforms.

Choose OpenSIPS for service provider routing, dynamic routing, load balancing and integrated management capabilities.
Choose Kamailio for WebRTC edge services, IMS deployments and environments that benefit from its extensive module ecosystem.

CloudSOE provides hardened Azure images for both platforms, allowing organisations to evaluate each using identical deployment standards.

Sizing Guidance

OpenSIPS is highly efficient and primarily processes SIP signalling rather than RTP media. CPU requirements are generally modest, while larger registration tables and routing databases benefit from additional memory. Media processing should remain on dedicated media servers or RTP relay infrastructure.

Evaluation and development: Standard_B2s (2 vCPU, 4 GB RAM)
Production routing core: Standard_D2s_v5 (2 vCPU, 8 GB RAM)
Large routing tables, high registration churn or carrier-scale deployments: Standard_D4s_v5 (4 vCPU, 16 GB RAM), scaling further based on registration volume and routing complexity.

Trademark Notice

OpenSIPS® is a registered trademark of its respective trademark holder. This product is independently packaged and maintained and is not affiliated with or endorsed by the OpenSIPS project or OpenSIPS Solutions.

OpenSIPS SIP Server on Azure

par Cloud SOE