Detailed recipe to deploy a self-contained IP Multimedia Subsystem (VoIP) core.

What is it about?

This is a step-by-step tutorial taylored to university teachers, researchers and students who want to teach / learn / experiment with IMS (IP Multimedia Subsystem). It describes how to setup a scenario with several Call Session Control Functions (basically, VoIP SIP servers), a Home Subscriber Server (the database that contains the VoIP subscribers' data) and a DNS server (to allow dynamic discovery), all of them running in a single computer. All products used are open source.

Featured Image

Photo by Growtika on Unsplash

Photo by Growtika on Unsplash

Why is it important?

The fact that the scenario runs in a single computer adds to its portability and makes it very easy to obtain causally-consistent flow graphs built with Wireshark. The specific configurations to get such traffic captures are especially detailed. These captures can be used by teachers who want to explain specific details of IMS traffic, by students who want to learn autonomously about those systems or to consolidate their already acquired knowledge, and by researchers who want to experiment with new configurations, architectures or protocols related to IMS.