To determine the best SIP server for your VoIP system look to OpenSIPS or Kamailio in 2025 you should read on. This is the perfect location for your decision. The two SIP server leaders stand out because they deliver outstanding performance with flexible functionalities and broad community backing. The selection process for the right solution among OpenSIPS and Kamailio creates difficulties among potential buyers.
The following article provides an energetic performance analysis between OpenSIPS and Kamailio along with a feature overview to guide your perfect selection.
What Are OpenSIPS and Kamailio?
We must first establish important fundamental points before exploring technical specifications.
OpenSIPS functions as an open-source SIP server which provides exceptional performance in dealing with large telephony infrastructure systems. Think scalability, speed, and flexibility.
The SIP server Kamailio functions as OpenSER before achieving its current name while it demonstrates excellent performance at routing SIP messages suitable for carrier-grade environments.
OpenSIPS vs Kamailio Performance Comparison (2025)
The performance speed and scalability of both platforms match at high levels although some essential differences emerge.
Call Handling Capacity
Kamailio: Known for ultra-lightweight processing—great for handling thousands of calls per second with minimal resource usage.
OpenSIPS provides its users with superior module-based features that provide advanced control systems needed for customized call logic at big-scale operations.
CPU and RAM Usage
Kamailio: Lower CPU load and memory footprint—ideal for lean, high-volume call environments.
OpenSIPS requires substantial computing resources when running applications which need extensive SIP processing abilities.
Latency & Throughput
Kamailio achieves superior speeds in message transmission despite OpenSIPS being very close behind in performance metrics.
Kamailio vs OpenSIPS Feature Comparison
Your business requirements will determine the winner from this competition.
Script Language
Kamailio: Great for fast routing scripts with strong caching.
OpenSIPS: Offers powerful scripting with dialog tracking, call control, and fraud detection.
Built-in Tools
OpenSIPS: Ships with a web-based GUI, load balancer, presence server, and awesome real-time dashboards.
The built-in tools in Kamailio remain modest while external tools form its backbone for operations.
Community & Documentation
Both have strong, active communities. OpenSIPS rolls out its updates more often while providing users with thorough documentation sources.
So, Who Wins in 2025?
It’s a close race! Raw performance seekers should choose Kamailio because it provides both simplicity and strong performance capabilities. OpenSIPS stands out as the superior option for users who want complete control and an extensive array of features alongside smooth service scaling.
