VoIP uses internal network technology instead of traditional cellular networks to make calls, in other words, it's a telephone service on the network.
VoIP (Voice over Internet Protocol) is a great technology that allows you to make free and cheap calls locally and worldwide and gives you a handful of other benefits and improvements over traditional telephony. To be able to use VoIP, you need a VoIP service.
VoIP service is the service that you get from a company (called a VoIP service provider) that allows making and receiving VoIP calls. It is like the Internet service you get from an Internet service provider or the phone service you get from a PSTN line telecom.

Possibility to create waiting queue
Your phone will never be occupied.

Conference and voice and video calls
Hold an audio or video conference.

Creating internal numbers, unlimited
Create an unlimited number of internal numbers..

High Definition Full HD Talk
Your conversations are Full HD.

Ability to manage, receive and send faxes
No need for equipment, have a fax.

Provide conversations report for users
Have your employees’ conversations.

Ability to answer on tablet and mobile phone
Answer the calls outside the office.

Capable of recording incoming and outgoing calls
Record conversations to cite.