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What is Voice over IP (VoIP)?

Voice over IP (VoIP) is the most common method for making phone calls over the internet. This is in contrast to traditional telephony, where communication is over the Public-Switched Telephone Network (PSTN).

What is the ‘IP’ in VoIP?

It standards for Internet Protocol, which gives unique addresses to every computer and other internet-connected device (either physical or virtual). This allows us to send and receive data between computers over the internet, including voice data for telephone calls.
What is the difference Between VoIP and traditional phone calls?
The main difference is that they use different networks. Traditional telephony uses the PSTN, while VoIP uses the internet.

What is the PSTN?

The PSTN is what most of us know as the phone network. It was originally a fixed-line analog network, but now the core of the PSTN is mostly digital. It consists of a mix of copper telephone lines, fibre optic cables, cellular networks and undersea cables.

As a circuit-switched network, the PSTN establishes a dedicated line between callers. This is a resource-intensive approach compared to VoIP, which sends call data over the internet to the recipient in labelled packets via the most efficient route. These packets are then re-assembled and converted back into audio so the recipient can hear what’s been said.

Are VoIP calls secure?

This all depends on whether your chosen VoIP solution is hosted in a secure data centre and is able to protect your voice data with technologies such as encryption.

Can you use VoIP to call non-VoIP users?

Yes, in the majority of cases, VoIP users can call non-VoIP mobile phones or landlines, which means you can get all the simplicity, flexibility and cost savings of VoIP, whoever you’re calling.

VoIP solutions use something called a VoIP gateway to connect with regular mobile phones and landlines via the PSTN network. The VoIP gateway also converts calls from traditional phones into IP, so anyone in the world can call you on your VoIP phone.

How can you migrate your telephony to VoIP?

There are four main ways you can do it:

Use your PC or laptop to make and receive VoIP calls

This converts your PC into a VoIP-enabled device. Your voice, captured by the device’s microphone, is converted into data packets, sent to the recipient, and played on the speakers of their PC – or on their headset. Many VoIP solutions also give you instant messaging and video calls on your PC, with no need for additional hardware.

Use a VoIP phone

VoIP phones such as IP and SIP telephones, convert audio signals into IP packets and send them to recipients over the internet. VoIP phones typically have Ethernet connections, which means you can plug them directly into your modem or router.

Use your existing phones to make VoIP calls

If you want to use your existing telephone to make VoIP calls, you’ll need an Analog Telephone Adapter (ATA). This allows you to plug your phone line into a modem or router. That means the analog phone calls can be converted into IP packets and sent over the internet. Converting existing phones into IP phones can help you maximise returns on investments in existing office equipment.

Use your mobile device to make VoIP calls

The fourth option is to make VoIP calls on your mobile device. You’ll need to download an FMC client, which allows your phone to connect into an internet telephony system. One benefit of this approach is that everyone can contact you on a single number, whether you’re at the office or on the move. The best internet telephony solutions also help you reduce costs by choosing the most efficient mobile connectivity option. Regardless that’s WLAN or mobile data on a carrier network.

Another benefit of making your mobile phone an extension of your office internet telephony system is that you can consolidate two costly lines (and service providers) to a single service provider. This saves you costs and reduces supplier management admin.

What are the benefits of VoIP?

The benefits of VoIP are many and varied, including support for new Unified Communications features and lower overall telephony costs. They include:

Lower costs

Typically, VoIP telephony is considerably more cost effective than traditional landline and mobile telephony. This is because VoIP transports voice data efficiently between callers over the internet. This is a contrast to traditional calls over the PSTN network. It requires a dedicated connection for the entire call duration.

Less hardware

The best VoIP solutions are hosted in the cloud. They provide the full range of telephony features with no need for costly physical telecommunications infrastructure. This lowers costs while also simplifying and speeding up deployment.

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Credit: https://www.nfon.com/en/service/knowledge-base/knowledge-base-detail/voice-over-ip/