How to Install Asterisk 15 with FreePBX 14 on Ubuntu 18.04 / Ubuntu 16.04...

This article is designed to help you Install Asterisk 15 on Ubuntu 18.04 / Ubuntu 16.04 / Debian 9 and manage it with FreePBX 14 GUI for administering Asterisk. Asterisk is an...

How to Install and Configure 3CX PBX on Ubuntu 18.04

In this guide, we'll cover the installation and configuration of 3CX on Ubuntu 18.04 Bionic Beaver Linux. This guide is a part of building an enterprise open source VOIP System on Linux. 3CX is an...

How to secure Asterisk and FreePBX from VoIP Fraud and Brute force attacks

In this guide, I'll show you how to secure your Asterisk and FreePBX setup by setting up an effective VoIP Blacklist using Geo-location filtering. Nowadays there are lots of brute force attack and VoIP...

How to Install Latest Kamailio SIP Server on Ubuntu 18.04 / Ubuntu 16.04

In this guide, I'll take you through complete steps to install and configure Kamailio SIP Server on Ubuntu 18.04 / Ubuntu 16.04 system. This guide is a part of building an...

How to Install Openfire XMPP chat server on Ubuntu 18.04 / Ubuntu16.04

Welcome to our guide on How to Install Openfire XMPP chat server on Ubuntu 18.04 / Ubuntu 16.04. Openfire is a popular and powerful instant messaging (IM) server utilizing XMPP/Jabber protocol....

Configuring IVR in Asterisk PBX Server

IVR is an Interactive Voice Response which takes input from a caller, perform an action based on that input, and return a result to the caller. Traditionally, IVR systems have been...

Configuring Softphones for Xmpp server

This is a short tutorial on how to configure XMPP account on X-Lite, Zoiper and Jitsi Sofphones to be used with XMPP server like Openfire. I'm writing this because someone requested for...

How to Install RTPProxy from Source in CentOS 7.x

RTPProxy is a software proxy delivering high-performance control to any kind of VoIP network infrastructure. RTPProxy enables the following services in a VoIP network. VoIP calls to traverse NAT firewalls systems ...

How To Install Kamailio SIP Proxy Server From Source In CentOS 7.x

I had earlier written a tutorial on How to install Kamailio in CentOS 7 from repo. The link to the article is below: How to Install Latest Kamailio SIP Server on CentOS...

Openstack Error Qemu-img: Could not open ‘/var/lib/libvirt/images/’ Permission Denied

Have you ever receive error message like below while working with Openstack and KVM?. If so, a fix is given here. Command: env LC_ALL=C LANG=C qemu-img info /var/lib/libvirt/images/asterisk.qcow2 Exit code: 1 Stdout: u'' Stderr: u"qemu-img:...