Qallixo Blog
Guides and comparisons on dialers, IVR, VoIP, CRM integration and open-source telephony.
Dialers & call center basics
What is a predictive dialer?
How predictive dialing works, how it differs from auto and preview dialing, and when each is the right call.
DialersAuto vs predictive vs progressive dialer
Every outbound dialing mode explained simply — and which one to use for your campaign.
VoiceWhat is click-to-call?
One click starts a call — from your website, a CRM record or your own app. How it works and how to add it.
BasicsWhat is VoIP?
How voice-over-IP turns your voice into data and sends calls over the internet — SIP, RTP and quality, explained.
Buying & integration guides
How to choose call center software in 2026
The features that matter, cloud vs self-hosted, and a checklist to compare platforms before you commit.
IntegrationsHow to integrate a call center with your CRM
Screen-pop, click-to-call, auto-logged calls and webhooks — connect your dialer to any CRM.
GrowthHow call center software boosts your business
Faster leads, more talk time, one-click broadcasts — and why calls beat email marketing.
Running a call center
How does a call center work?
Inbound vs outbound, IVR, queues, dialers and reporting — the whole flow, step by step.
OperationsCall center roles & responsibilities
Agent, team lead, supervisor, QA and manager — plus the role calls play in sales & marketing.
MetricsCall center KPIs & metrics that matter
AHT, FCR, service level, abandonment, occupancy, CSAT and conversion — what to track and why.
Open-source telephony
The engines behind VoIP — how they compare, and step-by-step Ubuntu install guides.
Asterisk vs FreeSWITCH vs Kamailio vs OpenSIPS
Media servers vs SIP proxies — what each is best at, and how to choose.
Install guideInstall Asterisk + FreePBX on Ubuntu
Build Asterisk 20 from source and add the FreePBX web GUI, securely.
Install guideInstall FreeSWITCH + FusionPBX on Ubuntu
Build FreeSWITCH from source and add the FusionPBX GUI.
Install guideInstall Kamailio on Ubuntu
The high-performance SIP server, from the official apt repo with a MySQL backend.
Install guideInstall OpenSIPS on Ubuntu
Install OpenSIPS 3.4 with opensips-cli and the database backend.
Install guideInstall RTPengine on Ubuntu
The media proxy for Kamailio & OpenSIPS — build it and wire it up.
Ready to see it live?
Start free with the whole platform unlocked — dialer, IVR, WhatsApp and reporting.