In the world of VoIP, clear, secure, and flexible call handling is everything. Whether you’re running a call center, telecom company, or hosted PBX platform, you need a SIP server that’s fast, reliable, and fully customizable.
That’s where OpenSIPS stands out.
With its rich set of features, OpenSIPS makes advanced call operations easy to manage and highly efficient. From smart call routing to secure topology hiding, OpenSIPS gives you the tools to run large-scale VoIP operations smoothly.
We’ll dive into how you can master advanced call operations using OpenSIPS, and explore the modules and features that make it a top choice for 2025 and beyond.
What is OpenSIPS?
OpenSIPS (Open SIP Server) is an open-source SIP server used for handling voice, video, and messaging in IP-based networks. It’s scalable, flexible, and known for handling thousands of calls per second in real-time.
Use cases include:
VoIP providers
Enterprise telephony
Wholesale call routing
WebRTC integration
Hosted PBX platforms
With OpenSIPS SIP server features, you get a powerful, scriptable environment for building your ideal communication setup.
OpenSIPS Call Routing: Smart, Scalable, Seamless
One of the most powerful features is OpenSIPS call routing.
OpenSIPS lets you:
Route calls based on prefix, domain, or user profile
Use failover and load balancing for reliability
Create custom routing logic via the configuration script
This flexibility is perfect for service providers who need to handle large call volumes while ensuring minimal downtime.
Pro Tip: Combine OpenSIPS with a billing platform or real-time database to apply dynamic call charges or restrict calls based on account balance.
OpenSIPS Advanced Call Handling: Beyond Basic VoIP
Want more control over how calls are handled? OpenSIPS has you covered with its advanced call handling capabilities.
You can:
Set up simultaneous or sequential ringing
Apply call forwarding rules
Enable voicemail, call pickup, and call park features
Handle call transfers, bridging, and recording
These features make it easy to offer advanced telephony services on top of basic SIP call functionality.
OpenSIPS Emergency Call Routing Module
Emergency calls require special handling to ensure speed, traceability, and legal compliance. With the OpenSIPS emergency call routing module, you can:
Route emergency calls to the nearest Public Safety Answering Point (PSAP)
Add location info to SIP headers
Ensure calls are handled even if main routes fail
This is critical for VoIP operators offering residential or business voice services.
???? Reminder: Many countries now require accurate emergency routing in VoIP systems. OpenSIPS makes compliance easier.
Topology Hiding with OpenSIPS: Boosting SIP Security
Security matters, especially in carrier-grade VoIP environments. OpenSIPS topology hiding helps protect your internal network structure.
Benefits include:
Preventing attackers from learning your network design
Blocking SIP tracing back to core servers
Reducing fraud and spam call attempts
This feature is especially useful when dealing with third-party SIP trunks or when building hosted VoIP platforms for clients.
Why Choose OpenSIPS for Advanced VoIP Operations?
Here’s why more providers are moving to OpenSIPS in 2025:
Highly customizable via script-based logic
Can handle thousands of calls per second
Offers robust security and topology protection
Supports complex routing, billing, and multi-tenant features
Integrates well with Asterisk, FreeSWITCH, Kamailio, and WebRTC
Whether you’re upgrading an old system or building from scratch, OpenSIPS is the smart foundation for modern VoIP infrastructures.
