FreeSWITCH-driven routing in OpenSIPS 2.3

SIP setups where OpenSIPS acts as a front-end for a farm of class 5 servers are becoming increasingly popular. Such architectures combine the best of both worlds: robust and optimized handling of SIP signaling with feature-rich class 5 softswitches. This way of integrating open-source projects has lead to a unique opportunity for our team, along with the FreeSWITCH team, to … Continue reading FreeSWITCH-driven routing in OpenSIPS 2.3

OpenSIPS minor releases 2.2.3 and 1.11.10

We are happy to announce a new set of OpenSIPS minor versions, namely 2.2.3 and 1.11.10, incorporating the last 4 months of backports and no less than 126 commits! While roughly half of these commits strictly relate to static code analysis issues (thank you Răzvan for the Coverity initiative!), the rest of them include important … Continue reading OpenSIPS minor releases 2.2.3 and 1.11.10

Troubleshooting missing ACK in SIP

We all experienced calls getting self disconnected after 5-10 seconds - usually disconnected by the callee side via a BYE request - but a BYE which was not triggered by the party behind the phone, but by the SIP stack/layer itself. This is one of the most common issues we get in SIP and one … Continue reading Troubleshooting missing ACK in SIP

Learning OpenSIPS

One of the interesting aspects of the project is that we care about training since the beginning.  We released the first OpenSER book in April 2008, followed by the OpenSIPS book in 2010 and the latest Building Telephony System with OpenSIPS 2nd edition in 2016.  I'm glad the books received  good reviews at Amazon and … Continue reading Learning OpenSIPS

RabbitMQ evolution with OpenSIPS 2.3

RabbitMQ is a powerful and widely used tool for message queuing integrations. And the usage of such a tool requires a more flexible support from OpenSIPS. Let's see what 2.3 has to offer when comes to RabbitMQ based integration. RabbitMQ is an open source message queuing/broker server, used by applications to publish messages on one side and consume them on the other … Continue reading RabbitMQ evolution with OpenSIPS 2.3

SIP-I and SIP with OpenSIPS 2.3

SIP-I considerations The SS7 interconnections are always painful. Both as cost and technical difficulty/complexity. So, as a more accessible alternative, the carriers started to offer SIP interconnection via SIP-I (SIP Infrastructure). SIP-I  or SIP Infrastructure (define by ITU) is very similar to SIP-T or SIP for Telephones (defined by IEFT). SIP-I is very powerful when … Continue reading SIP-I and SIP with OpenSIPS 2.3

Real-time billing using OpenSIPS 2.3 and CGRateS

SIP without billing is like a dinner without a good wine. While OpenSIPS does a great job for SIP, it often needs a billing partner to work with. CGRateS is an open-source rating engine used for carrier-grade, multi-tenant, real-time billing. It is able to do both postpaid and prepaid rating for multiple concurrent sessions with different balance units (eg: Monetary, … Continue reading Real-time billing using OpenSIPS 2.3 and CGRateS

Migrating registrations to OpenSIPS 2.2

Starting with OpenSIPS 2.2 the registered SIP contacts (stored the location table) have a new unique ID named contact ID. This new ID is contact specific (computed based on various contact elements) and it replaces the old opaque ID which was a simple DB auto-increment key. But why ? to increase the efficiency of the DB operations, by using a single value … Continue reading Migrating registrations to OpenSIPS 2.2

Introducing OpenSIPS 2.3

A new year has arrived, so it is the time for a new OpenSIPS major release - for OpenSIPS version 2.3 . For this version, the main focus on development is the "integration", the integration of OpenSIPS with various external entities. Why is integration so important to end up being the main tag of a major … Continue reading Introducing OpenSIPS 2.3