Introduction One of the more stubborn SIP interop problems in modern networks is reliable provisional response handling, especially when bridging classic SIP deployments with IMS-oriented environments. In IMS-heavy networks, RFC 3262 support is often assumed. That means 100rel, RSeq, RAck and PRACK are not optional extras anymore, but part of normal call establishment. On the … Continue reading SIP PRACK/UPDATE Interworking Support in OpenSIPS 4.0
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In real-life scenarios, the SIP routing is done across multiple IP interfaces (like public or private, different VPN's, IPv4 versus IPv6 or different protocols). Usually this is handled in OpenSIPS by picking / setting an outbound OpenSIPS socket for the handled call. But there are cases where such simple approach simply does not work: reaching … Continue reading Bond sockets in OpenSIPS 4.0
Modern SIP infrastructures increasingly rely on load balancers, reverse proxies and cloud edge services in order to provide scalability, security and geographic distribution. While these components are extremely useful, they often hide the original source address of the client from the backend SIP infrastructure. Starting with OpenSIPS 4.0, we are introducing support for the Proxy … Continue reading Proxy Protocol support in OpenSIPS 4.0
SIP forking is an important feature. It helps with parallel ringing, with class V features (like Hunt Groups), but also with failover (like multi-gateway/carrier failover). SIP parallel and serial forking means creating more and more branches (destinations) for a transaction, as the following real life scenarios demonstrate: Multi-level hunt groups in class V VPBX systems … Continue reading Big scale SIP forking
The upcoming OpenSIPS 4.0 release already includes a new feature for the clusterer module dubbed "Cluster-Bridge Replication". It mainly targets setups with multiple, geo-distributed data centers which make use of WAN links to exchange clustering data. Re-organizing the nodes into islands connected by bridges allows considerable bandwidth savings, especially if the WAN links are over … Continue reading Scaling Geo-Distributed OpenSIPS Clusters with Bridge Replication
Some time ago, we demonstrated how to dynamically tune OpenSIPS' runtime configuration using the OpenSIPS Control Panel in combination with the SQL Cacher module. While effective, that approach involved a certain level of configuration overhead to set up and maintain the SQL Cacher infrastructure. To address this, we’ve taken a significant step forward with the … Continue reading Dynamic Runtime Configuration using OpenSIPS 3.6 – continuation
When it comes to high-performance SIP platforms like OpenSIPS, flexibility and uptime are crucial, especially in scenarios involving Session Border Controllers (SBCs) and trunking services. Traditionally, OpenSIPS has only supported statically defined SIP sockets, meaning any changes — such as adding new sockets to support additional interconnections — required a full service restart. This limitation … Continue reading SIP Sockets Management at runtime in OpenSIPS 3.6
The brain of OpenSIPS is its script, holding the routing logic. And it order to reflect your custom routing logic - depending on the SIP service you implement -, the script is also a custom one. Meaning you need to build it. As part of building a script, the troubleshooting is an important aspect. While … Continue reading Troubleshooting the OpenSIPS routing logic
The OpenSIPS Control Panel is a powerful tool for managing OpenSIPS through a user-friendly web interface. It provides various features for interacting with OpenSIPS modules, leveraging both database operations and the Management Interface (MI). But what if you need to provision an arbitrary table used from the OpenSIPS config? This is where the TViewer module … Continue reading Mastering Custom Tables with OpenSIPS Control Panel
Running VoIP services in the cloud has become a common approach for providers seeking scalability and flexibility. A typical high-availability solution involves an active/standby pair of servers, where only one server is active while the others remain as warm backups, ready to take over at any moment. Different cloud providers offer various mechanisms to implement … Continue reading High Availability for VoIP in Microsoft Azure
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