News & Trends 13/04/2026

TOP 5 Best Virtual VoIP Call Center Systems of 2021

Reading time: 6 minutes

A virtual call center is the perfect solution for businesses in the digital transformation era. VoIP call center applications help maximize cost savings, enable fast and efficient deployment, and improve customer service quality and competitive advantage for businesses.

TOP 5 Best Virtual VoIP Call Center Systems of 2021

However, choosing a virtual call center system that fits your business is a difficult question. Many factors need to be considered, such as cost, features, and system security. This article will provide a comprehensive overview to help you choose a suitable call center system, saving both time and money.

OMICall – Smart Virtual Call Center for Businesses

OMICall is a professional 4.0 virtual call center system. It applies cloud computing platforms to improve customer service quality and business operational efficiency. With a user-friendly interface that is easy to use, it is suitable for many different business models.

Outstanding Features

Smart Call Center: Optimizes call costs by automatically prioritizing outgoing numbers on the same network as the customer, helping reduce voice charges by up to 40%. Manages call center staff in real-time.
Automation Marketing (SMS, Email): Automated marketing to nurture new and existing customers, supports easy brand name registration.
Smart Call Forwarding: Calls are transferred directly to the staff member responsible for the customer. Allows call forwarding based on pre-configured scenarios, or forwarding calls to telecom mobile numbers.
Omni-channel Sales Interaction: Built-in Facebook Fanpage management, video call feature with customers directly on the browser. Integrated SMS and Email channels for marketing and customer care.
Customer Management & Care: Built-in mini-CRM, Ticket system, staff management by department and role-based permissions.
Management & Statistical Reporting: Easily manage work performance, call history, and tickets. Detailed and specific work reports easily generated by the system.
Easy Integration: Already integrated with many CRM/ERP/management software such as Getfly, Hubspot, 1Office, Kiotviet, Sapo, Haravan, etc.

Advantages

Vietnamese interface, visually intuitive, easy to view and use — no technical expertise required.
Reasonable cost with many optimized features.
Enthusiastic staff, quick to get started, thorough and accurate consultation.
Already integrated with many CRM partners — almost everyone knows OMICall.
Increases internal interaction and manages customers in real-time.
Supports multi-channel aggregation into one system — OMICall (Hotline, Facebook, Zalo, Email, SMS, etc.)
Stable call signal transmission, high quality, rarely experiencing errors.
Conveniently usable on many different devices (laptop, smartphone, tablet, or IP Phone) — with IP Phone still being the best device for calls.

OnCall – Virtual Call Center Service

OnCall is a virtual call center service provided by FPT on the IP Cloud platform. It supports businesses in delivering high-quality calls and effective customer care, optimizing communication with customers through call center calls.

Outstanding Features

Unified communication solution
OnCall App
Receive voicemail via email
Call blocking
Supports voice and video calling software on PC and Smartphone
Comprehensive system: IP PBX, Call Center, internal calling, CRM.

Advantages

Simple, fast, and convenient deployment
Unlimited system scalability
Free internal call charges when calling within the system
Optimized human resources for call center system management
24/7 customer care staff
Supports use on multiple device types: IP Phone, Smartphone, PC

StringeeX – Omni-channel Customer Care Call Center

StringeeX provides a Contact Centre solution. The system helps deliver and enhance customer experience and build brand identity for businesses.

Outstanding Features

Smart call center
Automatic dialing system
Live Chat feature
Facebook Fanpage management feature
Zalo OA integration
Real-time monitoring
Contact management, customer management

Advantages

Beautiful interface
Good call routing, stable transmission speed
Can interact across multiple channels: voice calls, video calls, chat, email, SMS, Facebook, Zalo.

Cloud PBX – Virtual Call Center Service

Cloud PBX provides virtual call center services over the Internet, applying advanced Voice over IP (VoIP) technology with the ability to make calls over the Internet via LAN/WiFi/3G/4G connections.

Outstanding Features

All calls made with guaranteed quality over the Internet
Simple expansion, compatible with many devices: IP phone, softphone, smartphone, tablet, mobile.
Omnichannel customer care (Omnichannel Call Center)
Freshchat – Automates customer communication channels with Chatbot and AI
Text-to-speech conversion via Voicebot

Advantages

Simple operation
Allows easy setup, use, and expansion of extension numbers
Compatible with many devices

VoIP24h – Specialized VoIP Solutions

VoIP is a call center system that does not use traditional telephone lines. The call center applies a cloud platform to meet the modernization needs of businesses. VoIP is suitable for many types of businesses, from small and medium enterprises to large corporations.

Outstanding Features

Call statistics management
Audio conferencing
Integration of multiple number prefixes
Software integration API

Advantages

Businesses do not need dedicated IT staff to manage
Simple system upgrade and expansion
Cost savings for businesses
Ability to connect multiple sites
Supports call center use on mobile applications

The article has taken you through the 5 best virtual call centers available today. Depending on your business model and specific needs, choose the system that suits you best. Thank you sincerely for reading this article.

Try the Virtual Call Center Free for 7 Days

Many businesses may hesitate to choose a call center for various reasons. That is why OMICall has built a professional call center system, supporting customers 24/7, with a demo account available for 7 days at no cost.

Step 1: Visit the website omicall.com
Step 2: Register for a free trial on the homepage
Step 3: Enter your registration information for a demo account at https://sso.omicall.com/register
Step 4: Experience the OMICall virtual call center system completely free for 7 days

In just 4 simple steps, you can experience all the features of the virtual call center in the most hands-on way possible.