Introduction

This document outlines the compatibility matrix among various SRE releases and the dependencies they rely on. These dependencies may include operating system dependencies or sub-system dependencies, such as Kamailio serving as the SIP stack or PostgreSQL serving as the database, among other subsystems.

Subsystems Overview

Below is a list of the subsystems SRE relies on for various functions:

Subsystem	Description	Requirement	Location
PostgreSQL	SQL Database of SRE where all service data, data model editor definitions, service logics, configuration parameters, users, and alarms are stored.	Mandatory	EM and CP
MongoDB	NoSQL database for dynamic data such as call admission control (CAC) or registrar location service	Optional	CP and optionally EM (for arbitration)
InfluxDB	Time-series database where collected metrics are stored. These metrics are used both for dashboards and alarms.	Mandatory	EM
Kamailio	SIP stack acting as an interface between the network and the SRE broker and call processor processes	Mandatory	CP

Compatibility Matrix

Dependancy	SRE 3.0	SRE 3.1	SRE 3.2	SRE 3.3	SRE 4.0
RHEL 7.x	✅	✅	✅	✅	❌
CentOS 7.x	✅	✅	✅	✅	❌
RHEL 8.x	❌	❌	❌	❌	✅
AlmaLinux OS 8.x	❌	❌	❌	❌	✅
PostgreSQL 9.x	✅	✅	✅	❌	❌
PostgreSQL 14.x	❌	❌	✅	✅	✅
InfluxDB 2.x 1				✅	✅
MongoDB 3.6	✅	✅	✅	✅	✅
MongoDB 5.0	❌	❌	✅	✅	✅
Kamailio 4.2	✅	✅	❌	❌	❌
Kamailio 5.5	✅	✅	✅	✅	❌
Kamailio 5.7	❌	❌	❌	❌	✅

¹ InfluxDB was introduced in SRE 3.3 and is not relevant before that version